Takuya Takeishi

Assistant Professor, Kyoto Institute of Technology

e-mail: takeishi at kit.ac.jp

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

Schedules

Courses

• 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)

Publications

1. 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
2. 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.)
3. 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
4. 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.)
5. Y. Kubota and T. Takeishi, Reconstructing the Bost--Connes semigroup actions from K-theory, preprint (2017) arXiv:1709.03281

Talks

1. On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, Operator Algebra Seminar, Tokyo, April, 2013
2. On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, Recent Developments in Operator Algebras, Kyoto, September, 2013
3. On Class Field Theory, Conference of Functional Analysis, Kusatsu, September, 2013
4. On Nuclearity of C*-algebras of Fell Bundles over Étale Groupoids, MSJ Autumn Meeting 2013, Ehime, September, 2013
5. Bost-Connes system for local fields of characteristic zero, C*-algebra seminar, Oslo, January, 2014
6. Bost-Connes system for local fields of characteristic zero, Operator Algebra Seminar, Tokyo, April, 2014
7. Bost-Connes system for local fields of characteristic zero, ICM Satellite Conference on Operator Algebra and Applications, Korea, August, 2014
8. On Bost-Connes Systems, Conference of Functional Analysis, Gifu, August, 2014
9. Bost-Connes system for local fields of characteristic zero, MSJ Autumn Meeting 2014, Hiroshima, September, 2014
10. Bost-Connes system for local fields of characteristic zero, The Second China-Japan Conference on Noncommutative Geometry and K-Theory, Okinawa, October, 2014
    Slides
11. Irreducible Representations of Bost-Connes systems, Number theory and non-commutative geometry, Bonn, November, 2014
    Video on Youtube
12. Irreducible Representations of Bost-Connes systems, Workshop on Operator Theory and Operator Algebras, Tokyo, December, 2014
13. Irreducible Representations of Bost-Connes systems, Kyoto Operator Algebra Seminar, Kyoto, March, 2015
14. Irreducible Representations of Bost-Connes systems, Oberseminar, Münster, June, 2015
15. Irreducible Representations of Bost-Connes systems, Oberwolfach, June, 2015
16. Primitive Ideals of Bost-Connes C*-algebras, Geometry and Analysis seminar, London, September, 2015
17. On the classification problem of Bost-Connes systems, Operator Algebra Seminar, Copenhagen, October, 2015
18. Primitive ideals and K-theoretic approach to Bost-Connes systems, Münster, December, 2015
19. Primitive ideals and K-theoretic approach to Bost-Connes systems, Victoria, March, 2016
20. Primitive ideals and K-theoretic approach to Bost-Connes systems, Kyoto Operator Algebra Seminar, Kyoto, July, 2016
21. On the condition C^*_(G)=C^*_r(G) for étale groupoids (after R. Willett), Conference of Functional Analysis, Kusatsu, August, 2016
22. Primitive ideals and K-theoretic approach to Bost-Connes systems, Recent Developments in Operator Algebras, Kyoto, September, 2016
23. Primitive ideals and K-theoretic approach to Bost-Connes systems, MSJ Autumn Meeting 2016, Osaka, September, 2013
24. On the classification of Bost-Connes C*-algebras, Geometry and Analysis seminar, London, January, 2017
25. On the classification problem of Bost-Connes systems, Analysis Seminar, Sapporo, 2017
26. Basics of K-theory, Conference of Functional Analysis, Nara, August, 2017
27. Reconstructing the Bost-Connes semigroup actions from K-theory, Recent Developments in Operator Algebras, Kyoto, September, 2017
28. Reconstructing the Bost-Connes semigroup actions from K-theory, Facets of Irreversibility: Inverse Semigroups, Groupoids, and Operator Algebras, Oslo, Norway, December, 2017
29. Reconstructing the Bost-Connes semigroup actions from K-theory, Mathematical study on topological phases, RIMS, Kyoto, Japan, January 2018
30. Reconstructing the Bost-Connes semigroup actions from K-theory, MSJ Spring Meeting 2018, Tokyo, Japan, March, 2018
31. Reconstructing the Bost-Connes semigroup actions from K-theory. I, Operator theory seminar, Victoria, Canada, September, 2018
32. Reconstructing the Bost-Connes semigroup actions from K-theory. II, Operator theory seminar, Victoria, Canada, September, 2018

Poster Sessions

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

C.V.