Published on *Max Planck Institute for Mathematics* (http://www.mpim-bonn.mpg.de)

Posted in

- Talk [1]

Speaker:

Taiwang Deng
Affiliation:

UniversitĂ© Paris 13, Institut GalilĂ©e/MPIM
Date:

Wed, 2019-03-06 14:30 - 15:30 In this talk I will discuss the torsion classes in the cohomology of SL_2(Z) as well as its variant with compact support.

As a consequence, we show how to deduce congruences of cuspidal forms with Eisenstein classes modulo small primes.

This generalizes the previous results on Ramanujan tau functions.

**Links:**

[1] http://www.mpim-bonn.mpg.de/taxonomy/term/39

[2] http://www.mpim-bonn.mpg.de/node/3444

[3] http://www.mpim-bonn.mpg.de/node/246