Assistant Professor, Kyoto Institute of Technology

e-mail: takeishi at kit.ac.jp

Reserch interest: Bost-Connes systems, groupoid C*-algebras.

1 April 2018 - | moved to Kyoto Institute of Technology as an assistant professor. |
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12-19 July | Tokyo, Japan |

6-10 August | Sapporo, Japan |

28-31 August | Conference of Functional Analysis 2018, Kyoto, Japan |

10-25 September | Victoria, Canada |

12-23 October | London, UK |

- October 2018 - , Applied Geometry (Thu. 10:30-12:00).
- April 2018 - , Exercises in Mathematics I (Tue. 10:30-12:00).
- April 2018 - , Basic Calculus I (Tue. 8:50-10:20).
- April 2018 - , Mathematical Sciences I (Mon. 16:10-17:40), with Mamoru Asada and Yusuke Okuyama.
- April - August 2017, Vecror Calculus (Thu. 13:00-14:30), Kyoto Univ. (as a part-time lecturer of Institute for Liberal Arts and Sciences, Kyoto University)

- T. Takeishi, On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, Publ. RIMS,
**50**, no.2, 251-268. (2014) published version arXiv version - T. Takeishi, Irreducible Representations of Bost-Connes systems, J. Noncommut. Geom.
**10**, no. 3, 889-906. (2016) published version arXiv version

(**Note**: For arXiv version, the current version is 2. Several mistakes of notations are revised and section numbers are changed.) - T. Takeishi, Bost-Connes systems for local fields of characteristic zero, Int. Math. Res. Not.
**IMRN 2018**, no. 7, 2052-2069 (2018). published version arXiv:1511.02660 - T. Takeishi, Primitive ideals and K-theoretic approach to Bost-Connes systems, Adv. Math.
**302**, 1069-1079. (2016) published version arXiv version

(**Note**: For arXiv version, the current version is 2. Proposition 3.6, Remark 3.13, and several minor revisions are added.) - Y. Kubota and T. Takeishi, Reconstructing the Bost--Connes semigroup actions from K-theory, preprint (2017) arXiv:1709.03281

- On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, Operator Algebra Seminar, Tokyo, April, 2013
- On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, Recent Developments in Operator Algebras, Kyoto, September, 2013
- On Class Field Theory, Conference of Functional Analysis, Kusatsu, September, 2013
- On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, MSJ Autumn Meeting 2013, Ehime, September, 2013
- Bost-Connes system for local fields of characteristic zero, C*-algebra seminar, Oslo, January, 2014
- Bost-Connes system for local fields of characteristic zero, Operator Algebra Seminar, Tokyo, April, 2014
- Bost-Connes system for local fields of characteristic zero, ICM Satellite Conference on Operator Algebra and Applications, Korea, August, 2014
- On Bost-Connes Systems, Conference of Functional Analysis, Gifu, August, 2014
- Bost-Connes system for local fields of characteristic zero, MSJ Autumn Meeting 2014, Hiroshima, September, 2014
- Bost-Connes system for local fields of characteristic zero,
The Second China-Japan Conference on Noncommutative Geometry and K-Theory, Okinawa, October, 2014

Slides - Irreducible Representations of Bost-Connes systems, Number theory and non-commutative geometry, Bonn, November, 2014

Video on Youtube - Irreducible Representations of Bost-Connes systems, Workshop on Operator Theory and Operator Algebras, Tokyo, December, 2014
- Irreducible Representations of Bost-Connes systems, Kyoto Operator Algebra Seminar, Kyoto, March, 2015
- Irreducible Representations of Bost-Connes systems, Oberseminar, Münster, June, 2015
- Irreducible Representations of Bost-Connes systems, Oberwolfach, June, 2015
- Primitive Ideals of Bost-Connes C*-algebras, Geometry and Analysis seminar, London, September, 2015
- On the classification problem of Bost-Connes systems, Operator Algebra Seminar, Copenhagen, October, 2015
- Primitive ideals and K-theoretic approach to Bost-Connes systems, Münster, December, 2015
- Primitive ideals and K-theoretic approach to Bost-Connes systems, Victoria, March, 2016
- Primitive ideals and K-theoretic approach to Bost-Connes systems, Kyoto Operator Algebra Seminar, Kyoto, July, 2016
- On the condition C^*_(G)=C^*_r(G) for étale groupoids (after R. Willett), Conference of Functional Analysis, Kusatsu, August, 2016
- Primitive ideals and K-theoretic approach to Bost-Connes systems, Recent Developments in Operator Algebras, Kyoto, September, 2016
- Primitive ideals and K-theoretic approach to Bost-Connes systems, MSJ Autumn Meeting 2016, Osaka, September, 2013
- On the classification of Bost-Connes C*-algebras, Geometry and Analysis seminar, London, January, 2017
- On the classification problem of Bost-Connes systems, Analysis Seminar, Sapporo, 2017
- Basics of K-theory, Conference of Functional Analysis, Nara, August, 2017
- Reconstructing the Bost-Connes semigroup actions from K-theory, Recent Developments in Operator Algebras, Kyoto, September, 2017
- Reconstructing the Bost-Connes semigroup actions from K-theory, Facets of Irreversibility: Inverse Semigroups, Groupoids, and Operator Algebras, Oslo, Norway, December, 2017
- Reconstructing the Bost-Connes semigroup actions from K-theory, Mathematical study on topological phases, RIMS, Kyoto, Japan, January 2018
- Reconstructing the Bost-Connes semigroup actions from K-theory, MSJ Spring Meeting 2018, Tokyo, Japan, March, 2018
- Reconstructing the Bost-Connes semigroup actions from K-theory. I, Operator theory seminar, Victoria, Canada, September, 2018
- Reconstructing the Bost-Connes semigroup actions from K-theory. II, Operator theory seminar, Victoria, Canada, September, 2018

- Irreducible Representations of Bost-Connes systems, Future directions for non-commutative geometry, Bonn, December, 2014

March 2011 | Bachelor of Sciences, University of Tokyo |
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November 2012 - March 2016 | FMSP fellow |

March 2013 | Master of Mathematical Sciences, the University of Tokyo (Supervisor: Yasuyuki Kawahigashi) |

April 2013 - March 2016 | JSPS Fellow (DC1) |

March 2016 | Ph.D. of Mathematical Sciences, the University of Tokyo (Supervisor: Yasuyuki Kawahigashi) |

April 2016 - March 2017 | Program-Specific Researcher (Fujiwara's grant), Department of Mathematics, Kyoto University |

April 2017 - March 2018 | Researcher (part-time), Research Institute for Mathematical Sciences, Kyoto University |

April 2017 - August 2017 | Lecturer (part-time), Institute for Liberal Arts and Sciences, Kyoto University |

April 2018 - | Assistant Professor, Kyoto Institute of Technology |