#### Bilkent University Algebra Seminars

Obstructions for gluing biset functors II
Ergün Yalçın
Bilkent Üniversitesi, Turkey
Özet : Last week we introduced an obstruction theory for the existence and uniqueness of a solution to the gluing problem for a biset functor defined on the sections of a finite group G. The obstruction groups for this theory are the reduced cohomology groups of a category whose objects are the sections (U,V) of G with V not equal to 1, and whose morphisms are defined as a generalization of morphisms in the orbit category. This week we will show how these obstruction groups can be calculated using the work of Jackowski-Slominska on isotropy presheaves, and a theorem of Bob Oliver on the cohomology groups of the Quillen category of a finite group. This is a joint work with Olcay Coşkun.
 Tarih : 08.04.2019 Saat : 10:40 Yer : Bilkent Matematik Bölümü Seminer Odası SA - 141 Dil : English Not : Konuşma öncesinde çay-kurabiye ikramı yapılacaktır.