Title of Paper: Extensions of strict polynomial functors

Author: Marcin Chalupnik

Email: mchal@mimuw.edu.pl

Abstract: We compute Ext-groups between various strict polynomial
functors important in representation theory (eg. between twisted
Weyl and Schur functors). Our method utilizes: computation of the
Ext-groups between twisted divided and symmetric powers due to
Franjou-Friedlander-Scorichenko-Suslin, resolutions of functors by
divided and symmetric powers,  interplay between functors and
representations of the symmetric group.