Link do kanału youtube: https://www.youtube.com/channel/UCnHfrrAKk9Jaaw8oC2s_dSQ

Zoom platform link: https://us02web.zoom.us/j/83662713532?pwd=MFpVS1NlQkt4THVtMGdYNTR2Ym93UT09

Meeting ID: 836 6271 3532 Passcode: 764579

- Paul F. Baum
- Francesco D'Andrea
- Ludwik Dąbrowski
- Søren Eilers
- Piotr M. Hajac
- Frédéric Latrémolière
- Ryszard Nest
- Marc A. Rieffel
- Wojciech Szymański

2023-03-22, 17:15, 405 IMPAN & ZOOM

JONATHAN M. ROSENBERG (University of Maryland)

2023-03-15, 17:15, 405 IMPAN & ZOOM

ILYA SHAPIRO (University of Windsor)

Classically, coefficients for Hopf-cyclic homology were defined as objects that are both a module and a comodule with a compatibility between the two structures. This definition has been generalized to different settings with various levels of success. We will look at two cases where a limit-focused...

2023-03-08, 17:15, 405 IMPAN & ZOOM

MAYUKO YAMASHITA (RIMS, Kyoto University)

2023-03-01, 17:15, 405 IMPAN & ZOOM

ARUP KUMAR PAL (Indian Statistical Institute)

2023-02-22, 17:15, 405 IMPAN & ZOOM

TOMASZ MASZCZYK (Uniwersytet Warszawski)

2023-01-25, 17:15, 405 IMPAN & ZOOM

Piotr M. Hajac (IMPAN)

**THE COVARIANT FUNCTORIALITY OF GRAPH ALGEBRAS**In the standard category of directed graphs, morphisms respect the lengths of paths. However, this requirement is way too strong to present natural *-homomorphisms between graph C*-algebras as covariantly induced from morphisms of graphs, so we define a new category of directed graphs where morphism...

2023-01-18, 17:15, 405 IMPAN & ZOOM

HUA WANG (IMPAN)

**CONSTRUCTIONS OF QUANTUM GROUPS WITH THE RAPID DECAY PROPERTY**Starting with Haagerup's seminal work, the rapid decay (RD) property was systematically studied by Jolissaint for discrete groups, and later by Vergnioux, in the setting of discrete quantum groups. Through the work of many hands, the RD property is nowadays an interesting approximation p...

2023-01-11, 17:15, 405 IMPAN & ZOOM

AHMAD REZA HAJ SAEEDI SADEGH (Northeastern University)

**DEFORMATION SPACES, GETZLER'S RESCALING, AND AN EQUIVARIANT INDEX THEOREM FOR LIE GROUPOIDS**In recent work, Higson and Yi developed a new perspective on Getzler's symbol calculus, reinterpreting the latter in terms of a convolution algebra of sections of the rescaled bundle over the tangent groupoid of a spin manifold. We generalize the construction of the rescaled bundle to ...

2022-12-21, 17:15, 405 IMPAN & ZOOM

MARIUSZ TOBOLSKI (Uniwersytet Wrocławski)

**THE CONTRAVARIANT FUNCTORIALITY OF GRAPH ALGEBRAS**We introduce a subcategory of directed graphs for which the construction of Leavitt path algebras induces a contravariant functor into the category of algebras. Then we prove a theorem stating under which conditions this functor turns pushouts of directed graphs into pullbacks of algebras. Finally, ...

2022-12-14, 17:15, 405 IMPAN & ZOOM

JACEK KRAJCZOK (University of Glasgow)

**APPROXIMATION PROPERTIES FOR LOCALLY COMPACT QUANTUM GROUPS**One of the most widely studied properties of groups is the notion of amenability. In one of its many formulations, it gives us a way of approximating constant functions by functions in the Fourier algebra. The notion of amenability was relaxed in various directions. For instance, a very weak form of...