## Operator Algebra Seminars

Seminar information archive ～12/01｜Next seminar｜Future seminars 12/02～

Date, time & place | Wednesday 16:30 - 18:00 122Room #122 (Graduate School of Math. Sci. Bldg.) |
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**Seminar information archive**

### 2017/06/26

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Dimension, comparison, and almost finiteness (English)

**David Kerr**(Texas A & M Univ.)Dimension, comparison, and almost finiteness (English)

### 2017/05/29

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

On fundamental groups of tensor product II$_1$ factors (English)

**Yusuke Isono**(RIMS, Kyoto Univ.)On fundamental groups of tensor product II$_1$ factors (English)

### 2017/05/22

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

(English)

**Toshihiko Masuda**(Kyushu Univ.)(English)

### 2017/04/24

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Bass-Serre trees of amalgamated free product $C^*$-algebras (English)

**Kei Hasegawa**(Kyushu Univ.)Bass-Serre trees of amalgamated free product $C^*$-algebras (English)

### 2017/04/17

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

On diagonal actions whose full group is closed (English)

**Yoshikata Kida**(Univ. Tokyo)On diagonal actions whose full group is closed (English)

### 2017/04/10

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Reconstruction of the Bost-Connes groupoid from K-theoretic data (English)

**Yosuke Kubota**(Riken)Reconstruction of the Bost-Connes groupoid from K-theoretic data (English)

### 2016/12/12

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

The Roe cocycle and an index theorem on partitioned manifolds, and toward generalizations

(Japanese)

**Tatsuki Seto**(Nagoya Univ.)The Roe cocycle and an index theorem on partitioned manifolds, and toward generalizations

(Japanese)

### 2016/12/05

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

On a generalized Fraïssé limit construction (English)

**Shuhei Masumoto**(Univ.Tokyo)On a generalized Fraïssé limit construction (English)

### 2016/11/28

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

Fock space deformed by Coxeter groups (English)

**Takahiro Hasebe**(Hokkaido University)Fock space deformed by Coxeter groups (English)

### 2016/11/21

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

Finite-dimensional representations constructed from random walks (joint work with A. Erschler)

**Narutaka Ozawa**(RIMS, Kyoto Univ.)Finite-dimensional representations constructed from random walks (joint work with A. Erschler)

### 2016/10/31

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

Dual cocycles and equivariant deformation quantization (English)

**Sergey Neshveyev**(Univ. Oslo)Dual cocycles and equivariant deformation quantization (English)

### 2016/10/24

16:45-18:15 Room #117 (Graduate School of Math. Sci. Bldg.)

Cartan subalgebras of tensor products of free quantum group factors with arbitrary factors

**Yusuke Isono**(RIMS, Kyoto Univ.)Cartan subalgebras of tensor products of free quantum group factors with arbitrary factors

### 2016/10/17

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

Unitarizability, Maurey-Nikishin factorization and Polish groups of finite type (English)

**Hiroshi Ando**(Chiba Univ.)Unitarizability, Maurey-Nikishin factorization and Polish groups of finite type (English)

### 2016/10/03

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

$C^*$-tensor categories and subfactors for totally disconnected groups

(English)

**Yuki Arano**(Univ. Tokyo)$C^*$-tensor categories and subfactors for totally disconnected groups

(English)

### 2016/09/26

16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)

TBA

(English)

**Sorin Popa**(UCLA)TBA

(English)

### 2016/07/22

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Radius of comparison for $C^*$ crossed products by free minimal actions of amenable groups

**N. Christopher Phillips**(Univ. Oregon)Radius of comparison for $C^*$ crossed products by free minimal actions of amenable groups

### 2016/07/11

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Fraïssé Theory and Jiang-Su algebra

**Shuhei Masumoto**(Univ. Tokyo)Fraïssé Theory and Jiang-Su algebra

### 2016/06/20

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Bi-exact groups, strongly ergodic actions and group measure space type III factors with no central sequence

**Yusuke Isono**(RIMS, Kyoto Univ.)Bi-exact groups, strongly ergodic actions and group measure space type III factors with no central sequence

### 2016/06/13

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Lattices models for topological orders and boundary-bulk duality

**Liang Kong**(Univ. New Hampshire/Harvard Univ.)Lattices models for topological orders and boundary-bulk duality

### 2016/06/06

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Minimal ambient nuclear $C^*$-algebras

**Yuhei Suzuki**(Chiba Univ.)Minimal ambient nuclear $C^*$-algebras

### 2016/05/30

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

TBA

**Yosuke Kubota**(Univ. Tokyo)TBA

### 2016/05/09

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Surgery theory and discrete groups (English)

**Mikael Pichot**(McGill Univ./Univ．Tokyo)Surgery theory and discrete groups (English)

### 2016/04/25

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

Graded twisting of quantum groups, actions, and categories

**Makoto Yamashita**(Ochanomizu Univ.)Graded twisting of quantum groups, actions, and categories

### 2016/04/18

16:45-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

On the functoriality of Haagerup's $L^2$-space construction: Verticalizing decorated 2-categories

**Juan Orendain**(UNAM/Univ. Tokyo)On the functoriality of Haagerup's $L^2$-space construction: Verticalizing decorated 2-categories

### 2016/04/11

16:４５-18:15 Room #118 (Graduate School of Math. Sci. Bldg.)

On analytic construction of the group three-cocycles (English)

**Ryszard Nest**(Univ. Copenhagen)On analytic construction of the group three-cocycles (English)