Updated on 2024/04/23

写真a

 
TAKAHASHI Ryo
 
Organization
Graduate School of Mathematics Division of Mathematics Fundamental Mathematics Professor
Graduate School
Graduate School of Mathematics
Undergraduate School
School of Science Department of Mathematics
Title
Professor

Degree 3

  1. 博士(理学) ( 2004.3   岡山大学 ) 

  2. 修士(理学) ( 2002.3   岡山大学 ) 

  3. 学士(総合人間学) ( 2000.3   京都大学 ) 

Research Areas 1

  1. Natural Science / Algebra  / Commutative Algebra

Current Research Project and SDGs 1

  1. representation theory of commutative rings

Education 2

  1. Okayama University   Graduate School, Division of Science and Technology

    - 2004.3

      More details

    Country: Japan

  2. Kyoto University   Faculty of Integrated Human Studies

    - 2000.3

      More details

    Country: Japan

Professional Memberships 1

  1. 日本数学会

Awards 2

  1. MSJ Algebra Prize

    2020.3   The Mathematical Society of Japan   Subcategories of module categories of commutative rings

    Ryo Takahashi

     More details

    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. MSJ Takebe Prize

    2004.9   The Mathematical Society of Japan  

    Ryo Takahashi

     More details

    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

 

Papers 128

  1. Auslander-Reiten conjecture and finite injective dimension of Hom

    Ghosh, D; Takahashi, R

    KYOTO JOURNAL OF MATHEMATICS   Vol. 64 ( 1 )   2024.2

  2. Rings with q-torsionfree canonical modules Reviewed International coauthorship

    [122] Naoki Endo; Laura Ghezzi; Shiro Goto; Jooyoun Hong; Shin-ichiro Iai; Toshinori Kobayashi; Naoyuki Matsuoka; Ryo Takahashi

    The Mathematical Legacy of Wolmer V. Vasconcelos, De Gruyter Proc. Math., De Gruyter, Berlin     2024

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  3. Ring homomorphisms and local rings with quasi-decomposable maximal ideal Reviewed International coauthorship

    Saeed Nasseh; Keri Ann Sather-Wagstaff; Ryo Takahashi

    Communications in Algebra     2024

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  4. On a Verdier quotient of a derived category of a local ring Reviewed

    Yuki Mifune; Ryo Takahashi

    Journal of the Mathematical Society of Japan     2024

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  5. Annihilators and decompositions of singularity categories Reviewed International coauthorship

    Özgür Esentepe; Ryo Takahashi

    Proceedings of the Edinburgh Mathematical Society (2)     2024

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  6. Cofiniteness of local cohomology modules and subcategories of modules

    Takahashi, R; Wakasugi, N

    COLLECTANEA MATHEMATICA     2023.11

  7. On the categorical entropy of the Frobenius pushforward functor Reviewed

    Matsui, H; Takahashi, R

    BULLETIN OF THE LONDON MATHEMATICAL SOCIETY   Vol. 55 ( 3 ) page: 1358 - 1372   2023.6

     More details

    Language:English  

    DOI: 10.1112/blms.12796

    Web of Science

  8. Dominant Local Rings and Subcategory Classification Reviewed

    Takahashi, R

    INTERNATIONAL MATHEMATICS RESEARCH NOTICES   Vol. 2023 ( 9 ) page: 7259 - 7318   2023.5

     More details

    Language:English  

    DOI: 10.1093/imrn/rnac053

    Web of Science

  9. Faltings' annihilator theorem and <i>t</i>-structures of derived categories Reviewed

    Takahashi, R

    MATHEMATISCHE ZEITSCHRIFT   Vol. 304 ( 1 )   2023.5

     More details

  10. On the subcategories of <i>n</i>-torsionfree modules and related modules Reviewed

    Dey, S; Takahashi, R

    COLLECTANEA MATHEMATICA   Vol. 74 ( 1 ) page: 113 - 132   2023.1

     More details

  11. Remarks on complexities and entropies for singularity categories

    Takahashi, R

    COMPTES RENDUS MATHEMATIQUE   Vol. 361 ( 1 ) page: 1611 - 1623   2023

  12. Solid generators in module categories and applications Reviewed

    Ryo Takahashi

    Rendiconti del Seminario Matematico della Università di Padova     2023

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  13. When is a subcategory Serre or torsionfree? Reviewed

    K.-i. Iima, H. Matsui, K. Shimada, R. Takahashi

    Publ. Res. Inst. Math. Sci.     2023

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  14. Maximal Cohen-Macaulay tensor products and vanishing of Ext modules Reviewed

    Kimura, K; Otake, Y; Takahashi, R

    BULLETIN OF THE LONDON MATHEMATICAL SOCIETY   Vol. 54 ( 6 ) page: 2456 - 2468   2022.12

     More details

    Language:English  

    DOI: 10.1112/blms.12705

    Web of Science

  15. Spanier-Whitehead Categories of Resolving Subcategories and Comparison with Singularity Categories Reviewed

    Bahlekeh, A; Salarian, S; Takahashi, R; Toosi, Z

    ALGEBRAS AND REPRESENTATION THEORY   Vol. 25 ( 3 ) page: 595 - 613   2022.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10468-021-10037-x

    Web of Science

  16. Comparisons Between Annihilators of Tor and Ext Reviewed

    Dey, S; Takahashi, R

    ACTA MATHEMATICA VIETNAMICA   Vol. 47 ( 1 ) page: 123 - 139   2022.3

     More details

  17. Filtrations in Module Categories, Derived Categories, and Prime Spectra Reviewed

    Matsui, H; Takahashi, R

    INTERNATIONAL MATHEMATICS RESEARCH NOTICES   Vol. 2022 ( 5 ) page: 3457 - 3492   2022.2

     More details

    Language:English  

    DOI: 10.1093/imrn/rnaa284

    Web of Science

  18. ON REDUCING HOMOLOGICAL DIMENSIONS OVER NOETHERIAN RINGS Reviewed

    Araya, T; Takahashi, R

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 150 ( 2 ) page: 469 - 480   2022.2

     More details

    Language:English  

    DOI: 10.1090/proc/15785

    Web of Science

  19. Intersections of resolving subcategories and intersections of thick subcategories Reviewed

    Takahashi, R

    EUROPEAN JOURNAL OF MATHEMATICS   Vol. 7 ( 4 ) page: 1767 - 1790   2021.12

     More details

  20. Grothendieck groups, convex cones and maximal Cohen-Macaulay points Reviewed

    Takahashi, R

    MATHEMATISCHE ZEITSCHRIFT   Vol. 299 ( 1-2 ) page: 53 - 82   2021.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00209-020-02685-4

    Web of Science

  21. Trace ideals of canonical modules, annihilators of Ext modules, and classes of rings close to being Gorenstein Reviewed

    Dao, HL; Kobayashi, T; Takahashi, R

    JOURNAL OF PURE AND APPLIED ALGEBRA   Vol. 225 ( 9 )   2021.9

     More details

  22. Classification of dominant resolving subcategories by moderate functions Reviewed

    Takahashi, R

    ILLINOIS JOURNAL OF MATHEMATICS   Vol. 65 ( 3 ) page: 597 - 618   2021.9

     More details

    Language:English  

    DOI: 10.1215/00192082-9330146

    Web of Science

  23. Some criteria for detecting large homomorphisms of local rings Reviewed

    Gheibi, M; Takahashi, R

    COMMUNICATIONS IN ALGEBRA   Vol. 49 ( 8 ) page: 3490 - 3500   2021.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/00927872.2021.1899194

    Web of Science

  24. QUASI-PROJECTIVE DIMENSION Reviewed

    Gheibi, M; Jorgensen, DA; Takahashi, R

    PACIFIC JOURNAL OF MATHEMATICS   Vol. 312 ( 1 ) page: 113 - 147   2021.5

     More details

    Language:English  

    DOI: 10.2140/pjm.2021.312.113

    Web of Science

  25. Homogeneous prime elements in normal two-dimensional graded rings Reviewed

    Singh, AK; Takahashi, R; Watanabe, K

    JOURNAL OF ALGEBRA   Vol. 571   page: 339 - 349   2021.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2018.07.012

    Web of Science

  26. The Jacobian ideal of a commutative ring and annihilators of cohomology Reviewed

    Iyengar, SB; Takahashi, R

    JOURNAL OF ALGEBRA   Vol. 571   page: 280 - 296   2021.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2018.07.034

    Web of Science

  27. COHOMOLOGICAL DIMENSIONS OF SPECIALIZATION-CLOSED SUBSETS AND SUBCATEGORIES OF MODULES Reviewed

    Matsui, H; Nam, TT; Takahashi, R; Tri, NM; Yen, DN

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 149 ( 2 ) page: 481 - 496   2021.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/proc/15102

    Web of Science

  28. POWERS OF THE MAXIMAL IDEAL AND VANISHING OF (CO)HOMOLOGY Reviewed

    Celikbas, O; Takahashi, R

    GLASGOW MATHEMATICAL JOURNAL   Vol. 63 ( 1 ) page: 1 - 5   2021.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1017/S0017089519000466

    Web of Science

  29. Generation in module categories and derived categories of commutative rings Reviewed

    Ryo Takahashi

    Commutative algebra, Expository Papers Dedicated to David Eisenbud on the Occasion of his 75th Birthday, Springer, Cham     page: 723 - 751   2021

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Part of collection (book)  

  30. Resolving Subcategories Closed Under Certain Operations and a Conjecture of Dao and Takahashi Reviewed

    Sadeghi, A; Takahashi, R

    MICHIGAN MATHEMATICAL JOURNAL   Vol. 70 ( 2 ) page: 341 - 367   2021

     More details

    Language:English  

    Web of Science

  31. Resolving subcategories whose finitely presented module categories are abelian Reviewed

    Takahashi, R

    COMPTES RENDUS MATHEMATIQUE   Vol. 359 ( 5 ) page: 577 - 592   2021

     More details

    Language:English  

    DOI: 10.5802/crmath.197

    Web of Science

  32. FLAT RING EPIMORPHISMS AND UNIVERSAL LOCALIZATIONS OF COMMUTATIVE RINGS Reviewed

    Hügel, LA; Marks, F; Stovícek, J; Takahashi, R; Vitória, J

    QUARTERLY JOURNAL OF MATHEMATICS   Vol. 71 ( 4 ) page: 1489 - 1520   2020.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/qmath/haaa041

    Web of Science

  33. Construction of spectra of triangulated categories and applications to commutative rings Reviewed

    Matsui, H; Takahashi, R

    JOURNAL OF THE MATHEMATICAL SOCIETY OF JAPAN   Vol. 72 ( 4 ) page: 1283 - 1307   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2969/jmsj/82868286

    Web of Science

  34. Maximal Cohen-Macaulay modules that are not locally free on the punctured spectrum Reviewed

    Kobayashi, T; Lyle, J; Takahashi, R

    JOURNAL OF PURE AND APPLIED ALGEBRA   Vol. 224 ( 7 )   2020.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jpaa.2020.106311

    Web of Science

  35. A TOPOLOGY ON THE SET OF ISOMORPHISM CLASSES OF MAXIMAL COHEN-MACAULAY MODULES Reviewed

    Hiramatsu, N; Takahashi, R

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 148 ( 6 ) page: 2359 - 2369   2020.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/proc/14965

    Web of Science

  36. On the radius of the category of extensions of matrix factorizations Reviewed

    Shimada, K; Takahashi, R

    JOURNAL OF ALGEBRA   Vol. 546   page: 566 - 579   2020.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2019.10.054

    Web of Science

  37. Local rings with quasi-decomposable maximal ideal Reviewed

    Nasseh, S; Takahashi, R

    MATHEMATICAL PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY   Vol. 168 ( 2 ) page: 305 - 322   2020.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1017/S0305004118000695

    Web of Science

  38. Burch ideals and Burch rings Reviewed

    Dao, HL; Kobayashi, T; Takahashi, R

    ALGEBRA & NUMBER THEORY   Vol. 14 ( 8 ) page: 2121 - 2150   2020

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2140/ant.2020.14.2121

    Web of Science

  39. GORENSTEIN MODIFICATIONS AND Q-GORENSTEIN RINGS Reviewed

    Dao, H; Iyama, O; Takahashi, R; Wemyss, M

    JOURNAL OF ALGEBRAIC GEOMETRY   Vol. 29 ( 4 ) page: 729 - 751   2020

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/jag/760

    Web of Science

  40. LITTLE DIMENSION AND THE IMPROVED NEW INTERSECTION THEOREM Reviewed

    Nakamura, T; Takahashi, R; Yassemi, S

    MATHEMATICA SCANDINAVICA   Vol. 126 ( 2 ) page: 209 - 220   2020

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.7146/math.scand.a-119740

    Web of Science

  41. Generation in singularity categories of hypersurfaces of countable representation type Reviewed

    Araya, T; Iima, K; Ono, M; Takahashi, R

    ARCHIV DER MATHEMATIK   Vol. 113 ( 6 ) page: 603 - 615   2019.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00013-019-01374-x

    Web of Science

  42. Rings whose ideals are isomorphic to trace ideals Reviewed

    Kobayashi, T; Takahashi, R

    MATHEMATISCHE NACHRICHTEN   Vol. 292 ( 10 ) page: 2252 - 2261   2019.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/mana.201800309

    Web of Science

  43. ON THE IDEAL CASE OF A CONJECTURE OF HUNEKE AND WIEGAND Reviewed

    Celikbas, O; Goto, S; Takahashi, R; Taniguchi, N

    PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY   Vol. 62 ( 3 ) page: 847 - 859   2019.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1017/S0013091518000731

    Web of Science

  44. ON THE SECOND RIGIDITY THEOREM OF HUNEKE AND WIEGAND Reviewed

    Celikbas, O; Takahashi, R

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 147 ( 7 ) page: 2733 - 2739   2019.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/proc/14564

    Web of Science

  45. On the transitivity of degeneration of modules Reviewed

    Takahashi, R

    MANUSCRIPTA MATHEMATICA   Vol. 159 ( 3-4 ) page: 431 - 444   2019.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00229-018-1076-2

    Web of Science

  46. Ulrich modules over Cohen-Macaulay local rings with minimal multiplicity Reviewed

    Kobayashi, T; Takahashi, R

    QUARTERLY JOURNAL OF MATHEMATICS   Vol. 70 ( 2 ) page: 487 - 507   2019.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/qmath/hay055

    Web of Science

  47. Degenerations over (<i>A</i><sub>∞</sub>)-singularities and construction of degenerations over commutative rings Reviewed

    Hiramatsu, N; Takahashi, R; Yoshino, Y

    JOURNAL OF ALGEBRA   Vol. 525   page: 374 - 389   2019.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2018.12.031

    Web of Science

  48. Remarks on dimensions of triangulated categories Reviewed

    Aihara, T; Takahashi, R

    JOURNAL OF ALGEBRA   Vol. 521   page: 235 - 246   2019.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2018.12.001

    Web of Science

  49. Applications and homological properties of local rings with decomposable maximal ideals Reviewed

    Nasseh, S; Sather-Wagstaff, S; Takahashi, R; VandeBogert, K

    JOURNAL OF PURE AND APPLIED ALGEBRA   Vol. 223 ( 3 ) page: 1272 - 1287   2019.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jpaa.2018.06.006

    Web of Science

  50. Openness of the Regular Locus and Generators for Module Categories Reviewed

    Iyengar, SB; Takahashi, R

    ACTA MATHEMATICA VIETNAMICA   Vol. 44 ( 1 ) page: 207 - 212   2019.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s40306-018-0294-8

    Web of Science

  51. Totally reflexive modules and Poincare series Reviewed

    Gheibi, M; Takahashi, R

    JOURNAL OF ALGEBRA   Vol. 520   page: 440 - 459   2019.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2018.10.040

    Web of Science

  52. Noncommutative resolutions using syzygies Reviewed

    Dao, H; Iyama, O; Iyengar, SB; Takahashi, R; Wemyss, M; Yoshino, Y

    BULLETIN OF THE LONDON MATHEMATICAL SOCIETY   Vol. 51 ( 1 ) page: 43 - 48   2019.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1112/blms.12210

    Web of Science

  53. ASSOCIATED PRIMES AND SYZYGIES OF LINKED MODULES Reviewed

    Celikbas, O; Dibaei, MT; Gheibi, M; Sadeghi, A; Takahashi, R

    JOURNAL OF COMMUTATIVE ALGEBRA   Vol. 11 ( 3 ) page: 301 - 323   2019

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1216/JCA-2019-11-3-301

    Web of Science

  54. Two generalizations of Auslander-Reiten duality and applications Reviewed

    Arash Sadeghi, Ryo Takahashi

      Vol. 63   page: 335-351   2019

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  55. ON THE VANISHING OF SELF EXTENSIONS OVER COHEN-MACAULAY LOCAL RINGS Reviewed

    Araya, T; Celikbas, O; Sadeghi, A; Takahashi, R

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 146 ( 11 ) page: 4563 - 4570   2018.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/proc/13944

    Web of Science

  56. Structure of Irreducible Homomorphisms to/from Free Modules Reviewed

    Nasseh, S; Takahashi, R

    ALGEBRAS AND REPRESENTATION THEORY   Vol. 21 ( 2 ) page: 471 - 485   2018.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10468-017-9722-z

    Web of Science

  57. On the ideal case of a conjecture of Auslander and Reiten Reviewed

    Celikbas, O; Iima, K; Sadeghi, A; Takahashi, R

    BULLETIN DES SCIENCES MATHEMATIQUES   Vol. 142   page: 94 - 107   2018.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.bulsci.2017.09.005

    Web of Science

  58. Thick tensor ideals of right bounded derived categories of commutative rings Reviewed

    Takahashi, R

    REPRESENTATIONS OF ALGEBRAS   Vol. 705   page: 225 - 250   2018

     More details

    Language:English   Publishing type:Part of collection (book)  

    DOI: 10.1090/conm/705/14193

    Web of Science

  59. THICK SUBCATEGORIES OVER ISOLATED SINGULARITIES Reviewed

    Takahashi, R

    PACIFIC JOURNAL OF MATHEMATICS   Vol. 291 ( 1 ) page: 183 - 211   2017.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2140/pjm.2017.291.183

    Web of Science

  60. ON THE AUSLANDER-REITEN CONJECTURE FOR COHEN MACAULAY LOCAL RINGS Reviewed

    Goto, S; Takahashi, R

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   Vol. 145 ( 8 ) page: 3289 - 3296   2017.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/proc/13487

    Web of Science

  61. When are -syzygy modules -torsionfree? Reviewed

    Matsui, H; Takahashi, R; Tsuchiya, Y

    ARCHIV DER MATHEMATIK   Vol. 108 ( 4 ) page: 351 - 355   2017.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00013-017-1020-9

    Web of Science

  62. Singularity categories and singular equivalences for resolving subcategories Reviewed

    Matsui, H; Takahashi, R

    MATHEMATISCHE ZEITSCHRIFT   Vol. 285 ( 1-2 ) page: 251 - 286   2017.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00209-016-1706-x

    Web of Science

  63. Thick tensor ideals of right bounded derived categories Reviewed

    Matsui, H; Takahashi, R

    ALGEBRA & NUMBER THEORY   Vol. 11 ( 7 ) page: 1677 - 1738   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2140/ant.2017.11.1677

    Web of Science

  64. Ulrich ideals and almost Gorenstein rings Reviewed

    Shiro Goto, Ryo Takahashi, Naoki Taniguchi

      Vol. 144   page: 2811-2823   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  65. Annihilation of cohomology, generation of modules and finiteness of derived dimension Reviewed

    Abdolnaser Bahlekeh, Ehsan Hakimian, Shokrollah Salarian, Ryo Takahashi

      Vol. 67   page: 387-404   2016

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  66. Ulrich ideals and modules over two-dimensional rational singularities Reviewed

    Shiro Goto, Kazuho Ozeki, Ryo Takahashi, Kei-ichi Watanabe, Ken-ichi Yoshida

      Vol. 221   page: 69-110   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  67. Extension closedness of syzygies and local Gorensteinness of commutative rings Reviewed

    Shiro Goto, Ryo Takahashi

      Vol. 19   page: 511-521   2016

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  68. Perfect linkage of Cohen-Macaulay modules over Cohen-Macaulay rings Reviewed

    Kei-ichiro Iima, Ryo Takahashi

      Vol. 458   page: 134-155   2016

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  69. Annihilation of cohomology and strong generation of module categories Reviewed

    Srikanth B. Iyengar, Ryo Takahashi

    International Mathematics Research Notices. IMRN   Vol. 2016   page: 499-535   2016

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  70. Huneke-Wiegand conjecture and change of rings Reviewed

    Shiro Goto, Ryo Takahashi, Naoki Taniguchi, Hoang Le Truong

    J. Algebra   Vol. 422   page: 33-52   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  71. Classification of resolving subcategories and grade consistent functions Reviewed

    Hailong Dao, Ryo Takahashi

    Int. Math. Res. Not. IMRN   Vol. 2015   page: 119-149   2015

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  72. The dimension of a subcategory of modules Reviewed

    Hailong Dao, Ryo Takahashi

    Forum of Mathematics. Sigma   Vol. 3   2015

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  73. Generators and dimensions of derived categories of modules Reviewed

    Takuma Aihara, Ryo Takahashi

    Communications in Algebra   Vol. 43   page: 5003-5029   2015

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  74. Endofunctors of singularity categories characterizing Gorenstein rings Reviewed

    Takuma Aihara, Ryo Takahashi

    Proceedings of the American Mathematical Society   Vol. 143   page: 3777-3779   2015

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  75. Non-commutative resolutions and Grothendieck groups Reviewed

    Hailong Dao, Osamu Iyama, Ryo Takahashi, Charles Vial

    J. Noncommut. Geom.   Vol. 9   page: 21-34   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  76. Maximal Cohen-Macaulay approximations and Serre's condition Reviewed

    Hiroki Matsui, Ryo Takahashi

    Acta Math. Vietnam.   Vol. 40   page: 197-203   2015

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  77. Building modules from the singular locus Reviewed

    Jesse Burke, Lars Winther Christensen, Ryo Takahashi

    Math. Scand.   Vol. 116   page: 23-33   2015

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  78. Upper bounds for dimensions of singularity categories Reviewed

    Hailong Dao, Ryo Takahashi

    C. R. Math. Acad. Sci. Paris   Vol. 353   page: 297-301   2015

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  79. Almost Gorenstein rings -- towards a theory of higher dimension -- Reviewed

    Shiro Goto, Ryo Takahashi, Naoki Taniguchi

    J. Pure Appl. Algebra   Vol. 219   page: 2666-2712   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  80. Bounds on depth of tensor products of modules Reviewed

    Olgur Celikbas, Arashi Sadeghi, Ryo Takahashi

    J. Pure Appl. Algebra   Vol. 219   page: 1670-1684   2015

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  81. Ulrich ideals and modules Reviewed

    Shiro Goto, Kazuho Ozeki, Ryo Takahashi, Kei-ichi Watanabe, Ken-ichi Yoshida

    Math. Proc. Cambridge Philos. Soc.   Vol. 156 ( 1 ) page: 137-166   2014

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  82. Annihilation of cohomology and decompositions of derived categories Reviewed

    Srikanth B. Iyengar, Ryo Takahashi

    Homology, Homotopy Appl.   Vol. 16 ( 2 ) page: 231-237   2014

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  83. Modules that detect finite homological dimensions Reviewed

    Olgur Celikbas, Hailong Dao, Ryo Takahashi

    Kyoto J. Math.   Vol. 54 ( 2 ) page: 295-310   2014

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  84. Brauer-Thrall for totally reflexive modules over local rings of higher dimension Reviewed

    Olgur Celikbas, Mohsen Gheibi, Ryo Takahashi

    Algebr. Represent. Theory   Vol. 17 ( 3 ) page: 997-1008   2014

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  85. Reconstruction from Koszul homology and applications to module and derived categories Reviewed

    Ryo Takahashi

    Pacific J. Math.   Vol. 268 ( 1 ) page: 231-248   2014

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  86. The radius of a subcategory of modules Reviewed

    Hailong Dao, Ryo Takahashi

    Algebra Number Theory   Vol. 8 ( 1 ) page: 141-172   2014

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  87. Dimensions of triangulated categories with respect to subcategories Reviewed

    Takuma Aihara, Tokuji Araya, Osamu Iyama, Ryo Takahashi, Michio Yoshiwaki

    J. Algebra   Vol. 399   page: 205-219   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  88. Classifying resolving subcategories over a Cohen-Macaulay local ring Reviewed

    Ryo Takahashi

    Math. Z.   Vol. 273 ( 1 ) page: 569-587   2013

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  89. Thick subcategories over Gorenstein local rings that are locally hypersurfaces on the punctured spectra Reviewed

    Ryo Takahashi

    J. Math. Soc. Japan   Vol. 65 ( 2 ) page: 357-374   2013

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  90. Tilting and cluster tilting for quotient singularities Reviewed

    Osamu Iyama, Ryo Takahashi

    Math. Ann.   Vol. 356 ( 3 ) page: 1065-1105   2013

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  91. Auslander-Reiten conjecture and Auslander-Reiten duality Reviewed

    O. Celikbas, R. Takahashi

    J. Algebra   Vol. 382   page: 100-114   2013

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  92. On the structure of Cohen-Macaulay modules over hypersurfaces of countable Cohen-Macaulay representation type Reviewed

    T. Araya, K.-i. Iima, R. Takahashi

    J. Algebra   Vol. 361   page: 213-224   2012

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  93. On the left perpendicular category of the modules of finite projective dimension Reviewed

    Tokuji Araya, Kei-ichiro Iima, Ryo Takahashi

    Comm. Algebra   Vol. 40 ( 8 ) page: 2693-2699   2012

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  94. Contravariantly finite resolving subcategories over commutative rings Reviewed

    R. Takahashi

    Amer. J. Math.   Vol. 133 ( 2 ) page: 417-436   2011

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  95. When is there a nontrivial extension-closed subcategory? Reviewed

    R. Takahashi

    J. Algebra   Vol. 331 ( 1 ) page: 388-399   2011

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  96. Classifying thick subcategories of the stable category of Cohen-Macaulay modules Reviewed

    R. Takahashi

    Adv. Math.   Vol. 225 ( 4 ) page: 2076-2116   2010

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  97. Homological aspects of semidualizing modules Reviewed

    R. Takahashi, D. White

    Math. Scand.   Vol. 106 ( 1 ) page: 5-22   2010

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  98. On the existence of embeddings into modules of finite homological dimensions Reviewed

    R. Takahashi, S. Yassemi, Y. Yoshino

    Proc. Amer. Math. Soc.   Vol. 138 ( 7 ) page: 2265-2268   2010

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  99. On localizing subcategories of derived categories Reviewed

    R. Takahashi

    J. Math. Kyoto Univ.   Vol. 49 ( 4 ) page: 771-783   2009

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  100. Local cohomology based on a nonclosed support defined by a pair of ideals Reviewed

    R. Takahashi, Y. Yoshino, T. Yoshizawa

    J. Pure Appl. Algebra   Vol. 213 ( 4 ) page: 582-600   2009

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  101. Modules in resolving subcategories which are free on the punctured spectrum Reviewed

    R. Takahashi

    Pacific J. Math.   Vol. 241 ( 2 ) page: 347-367   2009

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  102. A generalization of a theorem of Foxby Reviewed

    T. Araya, R. Takahashi

    Arch. Math. (Basel)   Vol. 93 ( 2 ) page: 123-127   2009

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  103. Classifying subcategories of modules over a commutative noetherian ring Reviewed

    R. Takahashi

    J. Lond. Math. Soc. (2)   Vol. 78 ( 3 ) page: 767-782   2008

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  104. Quasi-socle ideals in a Gorenstein local ring Reviewed

    S. Goto, R. Takahashi, N. Matsuoka

    J. Pure Appl. Algebra   Vol. 212 ( 5 ) page: 969-980   2008

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  105. Direct summands of syzygy modules of the residue class field Reviewed

    R. Takahashi

    Nagoya Math. J.   Vol. 189   page: 1-25   2008

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  106. D-modules over rings with finite F-representation type Reviewed

    S. Takagi, R. Takahashi

    Math. Res. Lett.   Vol. 15 ( 3 ) page: 563-581   2008

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  107. Finite Gorenstein representation type implies simple singularity Reviewed

    L. W. Christensen, G. Piepmeyer, J. Striuli, R. Takahashi

    Adv. Math.   Vol. 218 ( 4 ) page: 1012-1026   2008

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  108. On vanishing of certain Ext modules Reviewed

    S. Goto, F. Hayasaka, R. Takahashi

    J. Math. Soc. Japan   Vol. 60 ( 4 ) page: 1045-1064   2008

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  109. On G-regular local rings Reviewed

    R. Takahashi

    Comm. Algebra   Vol. 36 ( 12 ) page: 4472-4491   2008

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  110. An uncountably infinite number of indecomposable totally reflexive modules Reviewed

    R. Takahashi

    Nagoya Math. J.   Vol. 187   page: 35-48   2007

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  111. A new approximation theory which unifies spherical and Cohen-Macaulay approximations Reviewed

    R. Takahashi

    J. Pure Appl. Algebra   Vol. 208 ( 2 ) page: 617-634   2007

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  112. On the number of indecomposable totally reflexive modules Reviewed

    R. Takahashi

    Bull. London Math. Soc.   Vol. 39 ( 3 ) page: 487-492   2007

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  113. Totally reflexive modules constructed from smooth projective curves of genus g >= 2 Reviewed

    R. Takahashi, K.-i. Watanabe

    Arch. Math. (Basel)   Vol. 89 ( 1 ) page: 60-67   2007

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  114. A characterization of modules locally of finite injective dimension Reviewed

    R. Takahashi

    Proc. Amer. Math. Soc.   Vol. 135 ( 11 ) page: 3461-3464   2007

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  115. Openness of FID-loci Reviewed

    R. Takahashi

    Glasg. Math. J.   Vol. 48 ( 3 ) page: 431-435   2006

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  116. Syzygy modules with semidualizing or G-projective summands Reviewed

    R. Takahashi

    J. Algebra   Vol. 295 ( 1 ) page: 179-194   2006

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  117. A note on a theorem of F. Wang and G. Tang Reviewed

    R. Takahashi

    Bull. Austral. Math. Soc.   Vol. 73   page: 293-297   2006

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  118. Remarks on modules approximated by G-projective modules Reviewed

    R. Takahashi

    J. Algebra   Vol. 301 ( 2 ) page: 748-780   2006

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  119. The existence of finitely generated modules of finite Gorenstein injective dimension Reviewed

    R. Takahashi

    Proc. Amer. Math. Soc.   Vol. 134 ( 11 ) page: 3115-3121   2006

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  120. On the category of modules of Gorenstein dimension zero Reviewed

    R. Takahashi

    Math. Z.   Vol. 251 ( 2 ) page: 249-256   2005

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  121. Homological invariants associated to semi-dualizing bimodules Reviewed

    T. Araya, R. Takahashi, Y. Yoshino

    J. Math. Kyoto Univ.   Vol. 45 ( 2 ) page: 287-306   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  122. Modules of G-dimension zero over local rings of depth two Reviewed

    R. Takahashi

    Illinois J. Math.   Vol. 48 ( 3 ) page: 945-952   2004

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  123. Upper complete intersection dimension relative to a local homomorphism Reviewed

    R. Takahashi

    Tokyo J. Math.   Vol. 27 ( 1 ) page: 209-219   2004

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  124. On the category of modules of Gorenstein dimension zero II Reviewed

    R. Takahashi

    J. Algebra   Vol. 278 ( 1 ) page: 402-410   2004

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  125. Characterizing Cohen-Macaulay local rings by Frobenius maps Reviewed

    R. Takahashi, Y. Yoshino

    Proc. Amer. Math. Soc.   Vol. 132 ( 11 ) page: 3177-3187   2004

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  126. Some characterizations of Gorenstein local rings in terms of G-dimension Reviewed

    R. Takahashi

    Acta Math. Hungar.   Vol. 104 ( 4 ) page: 315-322   2004

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  127. Upper Cohen-Macaulay dimension Reviewed

    T. Araya, R. Takahashi, Y. Yoshino

    Math. J. Okayama Univ.   Vol. 46   page: 17-30   2004

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  128. Nagata criterion for Serre's (Rn) and (Sn)-conditions Reviewed

    R. Takahashi

    Math. J. Okayama Univ.   Vol. 41   page: 37-43   1999

     More details

    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 6

  1. 各種の関数と次元による可換環の導来圏の研究

    Grant number:23K03070  2023.4 - 2026.3

    科学研究費助成事業  基盤研究(C)

    高橋 亮

      More details

    Authorship:Principal investigator 

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    圏(集合のようなもの)が与えられたとき、それの充満部分圏(部分集合のようなもの)のうち適切な条件をみたすものをすべて分類する・決定するという問題が考えられる。これは、数学の複数の分野にまたがって60年以上にわたり多くの研究者によって調べられてきた重要な問題である。本研究は、可換Noether環上の有限生成加群の有界複体全体のなす導来圏という特定の圏に対してこの問題を考察することを目的とする。

  2. Generation problems in module categories and derived categories of commutative noetherian rings

    Grant number:19K03443  2019.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Takahashi Ryo

      More details

    Authorship:Principal investigator 

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    I introduced a new class of commutative noetherian local rings which are called dominant local rings. I investigated basic properties of dominant local rings, and compare them with other classes of commutative noetherian local rings. Also, I gave various methods to get another one from a given dominant local ring. Moreover, under certain assumptions on the dominance of localizations, I classified suitable resolving subcategories of finitely generated modules, suitable thick subcategories of the bounded derived category of finitely generated modules, and the whole thick subcategories of the singularity category. This classification theorem recovers all the existing classification theorems in the same context.

  3. Generation problems of subcategories of the module category of a Cohen-Macaulay local ring(Fostering Joint International Research)

    Grant number:16KK0099  2017 - 2019

    Fund for the Promotion of Joint International Research (Fostering Joint International Research)

    Takahashi Ryo

      More details

    Authorship:Principal investigator 

    Grant amount:\13260000 ( Direct Cost: \10200000 、 Indirect Cost:\3060000 )

    Various results are obtained. In particular, many properties of the structure of Cohen-Macaulay modules are clarified. A Cohen-Macaulay local ring is said to have finite CM+ representation type if there are only finitely many indecomposable Cohen-Macaulay modules whose nonfree loci have positive dimension. For a Gorenstein ring of dimension one, it is proved that having finite CM+ representation type is equivalent to having either an isolated singularity or countable CM representation type. Consider the Grothendieck group of finitely generated modules modulo the subgroup spanned by pseudo-zero modules. Tensor the real number field and consider the convex cone spanned by Cohen-Macaulay modules. Various topological properties on this convex cone are obtained.

  4. Comprehensive research on representation theory of orders

    Grant number:16H03923  2016.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Iyama Osamu

      More details

    Authorship:Coinvestigator(s) 

    We studied the representation theory of orders mainly from a point of view of tilting theory, CM (=Cohen-Macaulay) representations, and AR (=Auslander-Reiten) theory. In addition to the following main results, we obtained a number of new results.
    (1) I gave an invited talk at the International Congress of Mathematicians 2018 on tilting theory and CM representations. We also published a book on Geigle-Lenzing complete intersections from AMS Memoir. (2) We made a great progress on a basic theory in tilting theory including torsion classes, reductions of triangulated categories, simple-minded collections, and so on. (3) We studied Auslander-Gorenstein algebras from a point of view of higher dimensional AR theory, and applied them to the study of non-commutative resolutions of singularities. We also made a systematic construction of d-representation-finite selfinjective algebras, and applied it to the study of the periodicity of trivial extension algebras.

  5. Thick subcategories and dimensions of derived categories of commutative rings

    Grant number:16K05098  2016.4 - 2020.3

    Takahashi Ryo

      More details

    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    The thick subcategories of the singularity category of a local ring with quasi-decomposable maximal ideal are completely classified. The cocompactly generated thick tensor ideals of the right bounded derived category of finitely generated modules over a commutative noetherian ring are completely classified. For the stable category of Cohen-Macaulay modules over an Iwanaga Gorenstein isolated singularity, being locally finite and having finite representation type turn out to be equivalent. It turns out to hold that if a finitely generated Krull-Schmidt triangulated category is locally finite, then it has dimension zero, and the converse is true if it is Ext-finite. It is found out that the residue field of a local hypersurface of countable representation type has level at most one with respect to each nonzero object.

  6. Foundations of rigid geometry from birational viewpoint

    Grant number:15H03607  2015.4 - 2019.3

    FUJIWARA KAZUHIRO

      More details

    Authorship:Other 

    Aimed for establishing foundational aspects of rigid geometry, "Foundations of rigid geometry I" (joint with F. Kato at titech) was published from EMS (2018). A new aspect, i.e., spectral theory of filtered rings, is added during the project. Also, perfectoid spaces, which have close connection to rigid geometry, are put into our plan. After P. Scholze's introduction, many applications of perfectoid spaces are known up to now. The principal investigator has tried to understand phenomena behind cohomological purity conjectures from perfectoid viewpoint, and has given a new proof of the absolute purity conjecture.

▼display all