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Progress in Geometric group theory

Research Project

Project/Area Number 15H05739
Research Category

Grant-in-Aid for Scientific Research (S)

Allocation TypeSingle-year Grants
Research Field Geometry
Research InstitutionKyoto University

Principal Investigator

Fujiwara Koji  京都大学, 理学研究科, 教授 (60229078)

Co-Investigator(Kenkyū-buntansha) 山口 孝男  京都大学, 理学研究科, 教授 (00182444)
小沢 登高  京都大学, 数理解析研究所, 教授 (60323466)
塩谷 隆  東北大学, 理学研究科, 教授 (90235507)
Project Period (FY) 2015-05-29 – 2020-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥79,040,000 (Direct Cost: ¥60,800,000、Indirect Cost: ¥18,240,000)
Fiscal Year 2019: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2018: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2017: ¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2016: ¥20,150,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥4,650,000)
Fiscal Year 2015: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Keywords写像類群 / 擬ツリー / カズダンの性質T / 射影複体 / 自由群の自己同型群 / 双曲群 / 指数増大度 / 漸近次元 / C*環 / フォンノイマン環 / 幾何学的群論 / 負曲率多様体 / 作用素環 / 離散群 / 測度集中 / 従順群 / property T / 作用素環論 / 距離幾何 / リーマン幾何 / property (T) / C*-algebra / metric measure geometry / collapsing / 増大度 / リーマン幾何学 / 群環 / 双曲幾何 / 自由群の外部自己同型群 / 擬準同型 / 外部自己同型
Outline of Final Research Achievements

During this project, Fujiwara with his joint work with Bestvina-Bromberg introduced the theory of Projection complex, and found several important applications. For example, we proved that a mapping class group acts on a finite product of quasi-tree with a QI-embedding orbit, and as a consequence it has finite asymptotic dimension. By now the technique of projection complex became an important tool in Geometric group theory.
Ozawa in his joint work with Kaluba-Novak proved that the automorphism group of the free group of rank 5 has property T, using computer. This settles a long standing problem. It also opens a new direction of research.

Academic Significance and Societal Importance of the Research Achievements

これらの結果は幾何学的群論の画期的な成果と評価されている。たとえば、代表者は2018年に開催された国際数学者会議で、射影複体の理論とその写像類群への応用について招待講演をした。また、代表者は2015年度日本数学会秋季賞を受賞した。
小澤が証明した5次自由群の自己同型群が性質Tをもつ、という定理は、長年の未解決問題に決着をつけるだけでなく、その手法において斬新で新しい研究の方向性を開いた点でも画期的である。

Assessment Rating
Verification Result (Rating)

A

Assessment Rating
Result (Rating)

A: Progress in the research is steadily towards the initial goal. Expected research results are expected.

Report

(11 results)
  • 2022 Research Progress Assessment (Verification Result) ( PDF )
  • 2021 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report   Abstract(Research Progress Assessment) ( PDF )   Research Progress Assessment (Result) ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Abstract ( PDF )   Comments on the Screening Results ( PDF )   Annual Research Report
  • Research Products

    (117 results)

All 2021 2020 2019 2018 2017 2016 2015 2014 Other

All Int'l Joint Research (12 results) Journal Article (50 results) (of which Int'l Joint Research: 26 results,  Peer Reviewed: 49 results,  Open Access: 16 results,  Acknowledgement Compliant: 7 results) Presentation (42 results) (of which Int'l Joint Research: 38 results,  Invited: 42 results) Book (5 results) Remarks (4 results) Funded Workshop (4 results)

  • [Int'l Joint Research] ユタ大学(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] レンヌ大/グルノーブル大(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ケンブリッジ大(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Univ Utah(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ユタ大学(米国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] ケンブリッジ大(英国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] ENS(フランス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Univ Utah(米国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Univ California, Davis(米国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Texas A&M University(米国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] ユタ大学/コーネル大学(米国)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] レンヌ大学(フランス)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Asymptotic dimension of planes and planar graphs.2021

    • Author(s)
      Fujiwara, Koji; Papasoglu, Panos
    • Journal Title

      Trans. Amer. Math. Soc.

      Volume: 374 Issue: 12 Pages: 8887-8901

    • DOI

      10.1090/tran/8487

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Proper actions on finite products of quasi-trees.2021

    • Author(s)
      Bestvina, Mladen; Bromberg, Ken; Fujiwara, Koji
    • Journal Title

      Ann. H. Lebesgue

      Volume: 4 Pages: 685-709

    • DOI

      10.5802/ahl.85

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On the joint spectral radius for isometries of non-positively curved spaces and uniform growth.2021

    • Author(s)
      Breuillard, Emmanuel; Fujiwara, Koji
    • Journal Title

      Ann. Inst. Fourier

      Volume: 71 Issue: 1 Pages: 317-391

    • DOI

      10.5802/aif.3374

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On characterizations of amenable C*-dynamical systems and new examples.2021

    • Author(s)
      Ozawa, Narutaka; Suzuki, Yuhei
    • Journal Title

      Selecta Math.

      Volume: 27

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Solvable groups of interval exchange transformations.2020

    • Author(s)
      Dahmani, Francois; Fujiwara, Koji; Guirardel, Vincent
    • Journal Title

      Ann. Fac. Sci. Toulouse Math.

      Volume: 29 Issue: 3 Pages: 595-618

    • DOI

      10.5802/afst.1641

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Graph manifolds as ends of negatively curved Riemannian manifolds2020

    • Author(s)
      Fujiwara Koji、Shioya Takashi
    • Journal Title

      Geometry & Topology

      Volume: 24 Issue: 4 Pages: 2035-2074

    • DOI

      10.2140/gt.2020.24.2035

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An entropic proof of cutoff on Ramanujan graphs2020

    • Author(s)
      N. Ozawa
    • Journal Title

      Electron. Commun. Probab

      Volume: 77 Issue: none

    • DOI

      10.1214/20-ecp358

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Narutaka Full factors and co-amenable inclusions.2020

    • Author(s)
      Bannon, Jon; Marrakchi, Amine; Ozawa,
    • Journal Title

      Comm. Math. Phys.

      Volume: 378 Pages: 1107-1121

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mankiewicz's theorem and the Mazur--Ulam property for C*-algebras2020

    • Author(s)
      M. Mori and N. Ozawa
    • Journal Title

      Studia Mathematica

      Volume: 250 Issue: 3 Pages: 265-281

    • DOI

      10.4064/sm180727-14-11

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inradius collapsed manifolds2020

    • Author(s)
      T. Yamaguchi and Z.Zhang
    • Journal Title

      Geometry and Topology, accepted.

      Volume: -

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Lipschitz homotopy convergence of Alexandrov spaces2020

    • Author(s)
      A. Mitsuishi and T. Yamaguchi
    • Journal Title

      to appear in J. Geom. Anal.

      Volume: -

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Good covering of Alexandrov spaces2020

    • Author(s)
      A. Mitsuishi and T. Yamaguchi
    • Journal Title

      To appear in Trans. AMS

      Volume: -

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Obtuse constants of Alexandrov spaces2020

    • Author(s)
      A. Mitsuishi and T. Yamaguchi
    • Journal Title

      to appear in J. Math. Soc. .Japan

      Volume: -

    • NAID

      130007733314

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Acylindrical actions on projection complexes.2019

    • Author(s)
      Bestvina, Mladen; Bromberg, Ken; Fujiwara, Koji; Sisto, Alessandro
    • Journal Title

      Enseign. Math.

      Volume: 65 Issue: 1 Pages: 1-32

    • DOI

      10.4171/lem/65-1/2-1

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The verbal width of acylindrically hyperbolic groups.2019

    • Author(s)
      Bestvina, Mladen, Bromberg, Kenneth, Fujiwara, Koji
    • Journal Title

      Algebr. Geom. Topol.

      Volume: 19 Issue: 1 Pages: 477-489

    • DOI

      10.2140/agt.2019.19.477

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Operator algebraic approach to inverse and stability theorems for amenable groups2019

    • Author(s)
      M. De Chiffre, N. Ozawa, and A. Thom
    • Journal Title

      Mathematika

      Volume: 65 Issue: 1 Pages: 98-118

    • DOI

      10.1112/s0025579318000335

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Norms of vector functionals2019

    • Author(s)
      M. Anoussis, N. Ozawa, and I. G. Todorov
    • Journal Title

      Proc. Amer. Math. Soc.

      Volume: 147 Issue: 5 Pages: 2017-2068

    • DOI

      10.1090/proc/14383

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Aut(F5) has property (T).2019

    • Author(s)
      Kaluba, Marek; Nowak, Piotr W.; Ozawa, Narutaka
    • Journal Title

      Math. Ann.

      Volume: 375 Pages: 1169-1191

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Good coverings of Alexandrov spaces2019

    • Author(s)
      Mitsuishi Ayato、Yamaguchi Takao
    • Journal Title

      Transactions of the American Mathematical Society

      Volume: 372 Issue: 11 Pages: 8107-8130

    • DOI

      10.1090/tran/7849

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lipschitz homotopy convergence of Alexandrov spaces.2019

    • Author(s)
      Mitsuishi, Ayato; Yamaguchi, Takao
    • Journal Title

      J. Geom. Anal.

      Volume: 29 Pages: 2217-2241

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Obtuse constants of Alexandrov spaces2019

    • Author(s)
      MITSUISHI Ayato、YAMAGUCHI Takao
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 71 Issue: 4 Pages: 1081-1103

    • DOI

      10.2969/jmsj/78917891

    • NAID

      130007733314

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inradius collapsed manifolds.2019

    • Author(s)
      Yamaguchi, Takao; Zhang, Zhilang
    • Journal Title

      Geom. Topol.

      Volume: 23 Issue: 6 Pages: 2793-2860

    • DOI

      10.2140/gt.2019.23.2793

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Isoperimetric rigidity and distributions of 1-Lipschitz functions2019

    • Author(s)
      Nakajima Hiroki、Shioya Takashi
    • Journal Title

      Advances in Mathematics

      Volume: 349 Pages: 1198-1233

    • DOI

      10.1016/j.aim.2019.04.043

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Computing Kazhdan Constants by Semidefinite Programming2018

    • Author(s)
      Fujiwara Koji、Kabaya Yuichi
    • Journal Title

      Experimental Mathematics

      Volume: 印刷中 Issue: 3 Pages: 301-312

    • DOI

      10.1080/10586458.2017.1396509

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constructing group actions on quasi-trees.2018

    • Author(s)
      Fujiwara, Koji
    • Journal Title

      Proceedings of the International Congress of Mathematicians;Rio de Janeiro 2018.

      Volume: II Pages: 1087-1114

    • Related Report
      2018 Annual Research Report
  • [Journal Article] High-dimensional metric-measure limit of Stiefel and flag manifolds.2018

    • Author(s)
      Shioya, Takashi; Takatsu, Asuka
    • Journal Title

      Math. Z.

      Volume: 290 Pages: 873-907

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-dimensional metric-measure limit of Stiefel and flag manifolds2018

    • Author(s)
      Shioya Takashi、Takatsu Asuka
    • Journal Title

      Mathematische Zeitschrift

      Volume: - Issue: 3-4 Pages: 1-35

    • DOI

      10.1007/s00209-018-2044-y

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A functional analysis proof of Gromov's polynomial growth theorem.2018

    • Author(s)
      Ozawa, Narutaka
    • Journal Title

      Ann. Sci. Ec. Norm. Super.

      Volume: 51 Issue: 3 Pages: 549-556

    • DOI

      10.24033/asens.2360

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finite-dimensional representations constructed from random walks.2018

    • Author(s)
      Erschler, Anna; Ozawa, Narutaka
    • Journal Title

      Comment. Math. Helv.

      Volume: 93 Issue: 3 Pages: 555-586

    • DOI

      10.4171/cmh/444

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Handlebody subgroups in a mapping class group.2017

    • Author(s)
      Bestvina, Mladen; Fujiwara, Koji
    • Journal Title

      Contemp. Math. "In the tradition of Ahlfors-Bers. VII". AMS.

      Volume: 696 Pages: 29-50

    • DOI

      10.1007/978-4-431-56021-0_7

    • ISBN
      9784431560197, 9784431560210
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Haagerup approximation property via bimodules2017

    • Author(s)
      R. Okayasu, N. Ozawa, R. Tomatsu
    • Journal Title

      Math. Scand.

      Volume: 121 Issue: 1 Pages: 75-91

    • DOI

      10.7146/math.scand.a-25970

    • NAID

      120006536945

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] C*-simplicity and the unique trace property for discrete groups2017

    • Author(s)
      E. Breuillard, M. Kalantar, M. Kennedy, N. Ozawa
    • Journal Title

      Publ. Math. Inst. Hautes Etudes Sci.

      Volume: 126 Issue: 1 Pages: 35-71

    • DOI

      10.1007/s10240-017-0091-2

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Constructing group actions on quasi-trees and applications.2016

    • Author(s)
      Fujiwara, Koji
    • Journal Title

      Sugaku

      Volume: 68 Pages: 113-128

    • NAID

      130006725305

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Bounded cohomology with coefficients in uniformly convex Banach spaces2016

    • Author(s)
      Bestvina, Mladen; Bromberg, Ken; Fujiwara, Koji
    • Journal Title

      Comment. Math. Helv.

      Volume: 91 Issue: 2 Pages: 203-218

    • DOI

      10.4171/cmh/383

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stable commutator length on mapping class groups.2016

    • Author(s)
      Bestvina, Mladen; Bromberg, Ken; Fujiwara, Koji
    • Journal Title

      Ann. Inst. Fourier

      Volume: 66 Issue: 3 Pages: 871-898

    • DOI

      10.5802/aif.3028

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On quasihomomorphisms with noncommutative targets2016

    • Author(s)
      K. Fujiwara and M. Kapovich
    • Journal Title

      Geom. Funct. Anal.

      Volume: 26 Issue: 2 Pages: 478-519

    • DOI

      10.1007/s00039-016-0364-9

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Noncommutative real algebraic geometry of Kazhdan's property (T).2016

    • Author(s)
      Ozawa, Narutaka
    • Journal Title

      J. Inst. Math. Jussieu

      Volume: 15 Issue: 1 Pages: 85-90

    • DOI

      10.1017/s1474748014000309

    • NAID

      120005704223

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A continuum of C*-norms on B(H) \otimes B(H) and related tensor products2016

    • Author(s)
      N. Ozawa and G. Pisier
    • Journal Title

      Glasg. Math. J.

      Volume: 58 Issue: 2 Pages: 433-443

    • DOI

      10.1017/s0017089515000257

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] A remark on fullness of some group measure space von Neumann algebras2016

    • Author(s)
      Narutaka Ozawa
    • Journal Title

      Compos. Math.

      Volume: 152 Issue: 12 Pages: 2493-2502

    • DOI

      10.1112/s0010437x16007727

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Subgroups generated by two pseudo-Anosov elements in a mapping class group. II. Uniform bound on exponents2015

    • Author(s)
      Fujiwara, Koji
    • Journal Title

      Trans. Amer. Math. Soc.

      Volume: 367 Issue: 6 Pages: 4377-4405

    • DOI

      10.1090/s0002-9947-2014-06292-2

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Asymptotically isometric metrics on relatively hyperbolic groups and marked length spectrum2015

    • Author(s)
      K. Fujiwara
    • Journal Title

      J. Topol. Anal.

      Volume: 7 Issue: 02 Pages: 345-359

    • DOI

      10.1142/s1793525315500132

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Counting subgraphs in hyperbolic graphs with symmetry2015

    • Author(s)
      Calegari, Danny; Fujiwara, Koji
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 67 Issue: 3 Pages: 1213-1226

    • DOI

      10.2969/jmsj/06731213

    • NAID

      130005094188

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Elementary amenable groups are quasidiagonal2015

    • Author(s)
      N. Ozawa, M. Rordam, Y. Sato
    • Journal Title

      Geometric and Functional Analysis

      Volume: 25 Issue: 1 Pages: 307-316

    • DOI

      10.1007/s00039-015-0315-x

    • NAID

      120005621951

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Group approximation in Cayley topology and coarse geometry, Part III: Geometric property (T)2015

    • Author(s)
      M. Mimura, N. Ozawa, H. Sako, and Y. Suzuki
    • Journal Title

      Algebraic and Geometric Topology

      Volume: 15 Issue: 2 Pages: 1067-1091

    • DOI

      10.2140/agt.2015.15.1067

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] A remark on amenable von Neumann subalgebras in a tracial free product.2015

    • Author(s)
      ozawa, narutaka
    • Journal Title

      Proc. Japan Acad. Ser. A Math. Sci

      Volume: 91 Issue: 7 Pages: 104-104

    • DOI

      10.3792/pjaa.91.104

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Real positivity and approximate identities in Banach algebras2015

    • Author(s)
      D. Blecher and N. Ozawa
    • Journal Title

      Pacific J. Math.

      Volume: 277 Issue: 1 Pages: 1-59

    • DOI

      10.2140/pjm.2015.277.1

    • NAID

      120005690135

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Limit formulas for metric measure invariants and phase transition property2015

    • Author(s)
      R. Ozawa and T. Shioya
    • Journal Title

      Math. Z

      Volume: 280 Issue: 3-4 Pages: 759-782

    • DOI

      10.1007/s00209-015-1447-2

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Collaspsing three-dimensional closed Alexandrov spaces.2015

    • Author(s)
      A. Mitsuishi and T. Yamaguchi
    • Journal Title

      Transactions of AMS.

      Volume: 367 Issue: 4 Pages: 2339-2410

    • DOI

      10.1090/s0002-9947-2014-06091-1

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Constructing group actions on quasi-trees and applications to mapping class groups2014

    • Author(s)
      M. Bestvina, K. Bromberg and K. Fujiwara
    • Journal Title

      Publ. IHES

      Volume: Published online Issue: 1 Pages: 1-64

    • DOI

      10.1007/s10240-014-0067-4

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Locally strongly Lipschitz contractibility of Alexandrov spaces2014

    • Author(s)
      A. Mitsuishi and T. Yamaguchi
    • Journal Title

      Pacific J.

      Volume: 270 Issue: 1 Pages: 393-421

    • DOI

      10.1007/s10711-014-0017-9

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Growth of hyperbolic groups.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Seminar "Action". ENS Lyon. France
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Growth of hyperbolic groups.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometry seminar. U Chicago. USA.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Growth of hyperbolic groups.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometry and Analysis on Groups Seminar, U of Vienna.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymptotic dimension of planes.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Differentialgeometrie im Grossen, MFO, Germany.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rates of growth in a hyperbolic group.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Artin Groups, CAT(0) geometry and related topics, A conference in honor of RUTH CHARNEY. Ohio State University. USA.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Growth of hyperbolic groups.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      SFB-Lecture, Regensburg, Germany
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymptotic dimension of planes.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      The 17th East Asian Conference on Geometric Topology. Korea.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Growth of acylindrically hyperbolic groups.2021

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometric Structures in Group Theory. MFO, Germany.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Kazhdan’s property (T) and semidefinite programming2021

    • Author(s)
      Ozawa Narutaka
    • Organizer
      Colloquim, Princeton University
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Growth of hyperbolic groups.2020

    • Author(s)
      Koji Fujiwara
    • Organizer
      'Geometric Structures in Group Theory', MFO. Germany.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Growth of hyperbolic groups.2020

    • Author(s)
      Koji Fujiwara
    • Organizer
      Group theory seminar, ENS, Paris.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees.2019

    • Author(s)
      Koji Fujiwara
    • Organizer
      "Cohomological methods" Simons Semester Conference. Banach Center. Warsaw. Poland.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees.2019

    • Author(s)
      Koji Fujiwara
    • Organizer
      Aspects of Non-Positive and Negative Curvature in Group Theory. (Bestvina Fest) CIRM, France.
    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Invited
  • [Presentation] Asymptotic Dimension of the Arc Graphs.2019

    • Author(s)
      Koji Fujiwara
    • Organizer
      Topology fair. KAIST, Korea.
    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] he Furstenberg boundary and C*-simplicity2019

    • Author(s)
      Ozawa Narutaka
    • Organizer
      IMPAN
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymptotic Dimension of the Arc Graphs. Special Session on Mapping Class Groups.2019

    • Author(s)
      Koji Fujiwara
    • Organizer
      AMS Sectional Meeting. Hawaii University, USA.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymptotic Dimension of the Arc Graphs.2019

    • Author(s)
      Koji Fujiwara
    • Organizer
      Special Session on Mapping Class Groups.AMS Sectional Meeting. Hawaii University, USA.
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quickly generating a nice hyperbolic element.2018

    • Author(s)
      Koji Fujiwara
    • Organizer
      GAGTA-2018 (July 15-20, 2018, KIAS, Seoul, Korea)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees.2018

    • Author(s)
      Koji Fujiwara
    • Organizer
      International Congress of Mathematicians, 2018. Topology section. Brazil.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quickly generating a nice hyperbolic element.2018

    • Author(s)
      Koji Fujiwara
    • Organizer
      GAGTA-2018. KIAS, Seoul, Korea
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees.2018

    • Author(s)
      Koji Fujiwara
    • Organizer
      ICM 2018. Brazil.
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The Furstenberg boundary and C*-simplicity2018

    • Author(s)
      Narutaka Ozawa
    • Organizer
      Boundaries of topological groups with applications to Lyapounov exponents, symmetric spaces, and C*-algebras
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Isoperimetric rigidity and distributions of 1-Lipschitz functions2018

    • Author(s)
      Takashi Shioya
    • Organizer
      第4回日中幾何学研究集会,University of Science and Technology of China,Hefei(中国)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Collapsing Riemannian manifolds with boundary2018

    • Author(s)
      Takao Yamaguchi
    • Organizer
      The sixth German-Japanese University Presidents’ Conference, Osaka University,
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 境界つきリーマン多様体の崩壊2018

    • Author(s)
      山口孝男
    • Organizer
      日本数学会年会総合講演 東京大学
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Quickly generating a nice hyperbolic element.2017

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometric and probabilistic properties of infinite groups. Lille, France.
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Finite-dimensional representations constructed from random walks2017

    • Author(s)
      Narutaka Ozawa
    • Organizer
      Von Neumann algebras and measured group theory
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Minicourse on Connes's Embedding Problem and its equivalent2017

    • Author(s)
      Narutaka Ozawa
    • Organizer
      Analysis in Quantum Information Theory
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Isoperimetric rigidity and distributions of 1-Lipschitz functions2017

    • Author(s)
      Takashi Shioya
    • Organizer
      Global Differential Geometry Workshop, Tsinghua Sanya International Mathematics Forum, サンヤ(中国)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Isoperimetric rigidity and distributions of 1-Lipschitz functions2017

    • Author(s)
      Takashi Shioya
    • Organizer
      Metrics and Measures,東北大学
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Soft isoperimetric rigidity2017

    • Author(s)
      Takashi Shioya
    • Organizer
      Metric Measure Spaces and Ricci Curvature, Max Planck Institute for Mathematics, Bonn
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High-dimensional spaces in metric measure geometry2017

    • Author(s)
      Takashi Shioya
    • Organizer
      Geometric Analysis on smooth and non-smooth spaces,SISSA, トリエステ,イタリア
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 2016.7.6. Acylindrically hyperbolic groups are not invariably generated, 1.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometric Topology Fair in Korea, Kaist, Deajeon. Korea.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 2016.7.8. Acylindrically hyperbolic groups are not invariably generated, 2.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Geometric Topology Fair in Korea, Kaist, Deajeon. Korea.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Acylindrically hyperbolic groups are not invariably generated.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Rigidity School, Nagoya 2016. Nagoya U.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quasi-homomorphisms into non-commutative groups.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Rigidity School, Nagoya 2016. Nagoya U.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Hyperbolic-like behaviour of groups.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Introductory Workshop: Geometric Group Theory, MSRI. Berkeley. USA.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Computing Kazhdan constants by computer.2016

    • Author(s)
      Koji Fujiwara
    • Organizer
      Non-positive Curvature, Newton Institute, U Cambridge, UK.
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees and quasi-morphisms.2015

    • Author(s)
      藤原耕二
    • Organizer
      日本数学会秋季総合分科会、秋季賞受賞講演
    • Place of Presentation
      京都産業大学
    • Year and Date
      2015-09-14
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Group actions on quasi-trees and its application, 1-4.2015

    • Author(s)
      koji fujiwara
    • Organizer
      The 13th Geometric Topology Fair in Korea.
    • Place of Presentation
      Gyeongju, Korea.
    • Year and Date
      2015-08-10
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of contracting geodesics.2015

    • Author(s)
      koji fujiwara
    • Organizer
      Conference on Geometric Group Theory
    • Place of Presentation
      Wroclaw, Poland.
    • Year and Date
      2015-06-29
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Handlebody subgroups in mapping class groups.2015

    • Author(s)
      koji fujiwara
    • Organizer
      Dubrovnik VIII - Geometric Topology, Geometric Group Theory & Dynamical Systems
    • Place of Presentation
      Inter-University Centre Dubrovnik, Croatia
    • Year and Date
      2015-06-22
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] 離散群の幾何学2021

    • Author(s)
      藤原耕二
    • Total Pages
      224
    • Publisher
      朝倉書店
    • ISBN
      9784254117554
    • Related Report
      2019 Annual Research Report
  • [Book] サーストン万華鏡2020

    • Author(s)
      藤原耕二ほか
    • Total Pages
      240
    • Publisher
      共立出版
    • ISBN
      9784320114371
    • Related Report
      2019 Annual Research Report
  • [Book] Geometry and topology of manifolds, Springer Proc. Math. Stat., 154,2016

    • Author(s)
      Koji Fujiwara etal
    • Publisher
      Springer
    • Related Report
      2016 Annual Research Report
  • [Book] Metric measure geometry. Gromov's theory of convergence and concentration of metrics and measures. IRMA Lectures in Mathematics and Theoretical Physics, 25.2016

    • Author(s)
      Shioya, Takashi
    • Total Pages
      182
    • Publisher
      EMS Publishing House, Zurich,
    • ISBN
      9783037191583
    • Related Report
      2016 Annual Research Report
  • [Book] Geometry and topology of manifolds, Springer Proc. Math. Stat., 154,2016

    • Author(s)
      Shioya, Takashi etal
    • Publisher
      Springer
    • Related Report
      2016 Annual Research Report
  • [Remarks] 幾何学的群論の深化と展開

    • Related Report
      2019 Annual Research Report
  • [Remarks] Koji Fujiwara

    • URL

      https://www.math.kyoto-u.ac.jp/~kfujiwara/

    • Related Report
      2017 Annual Research Report
  • [Remarks] 基盤研究(S) 「幾何学的群論の深化と展開」

    • URL

      https://www.math.kyoto-u.ac.jp/~kfujiwara/kakenS

    • Related Report
      2017 Annual Research Report 2016 Annual Research Report 2015 Annual Research Report
  • [Remarks] koji fujiwara

    • URL

      https://www.math.kyoto-u.ac.jp/~kfujiwara/

    • Related Report
      2015 Annual Research Report
  • [Funded Workshop] FUKAYA 60 GEOMETRY AND EVERYTHING2018

    • Related Report
      2017 Annual Research Report
  • [Funded Workshop] 離散群の幾何解析2016

    • Related Report
      2016 Annual Research Report
  • [Funded Workshop] Geometric analysis on Riemannian and metric spaces2016

    • Related Report
      2016 Annual Research Report
  • [Funded Workshop] 確率論と幾何学2016

    • Related Report
      2016 Annual Research Report

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Published: 2015-06-03   Modified: 2023-10-16  

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