**Wintersemester 2018/19**

**Unless otherwise specified talks take place in room 119 (Arnimallee 3) at 16:15**

**Schedule**

**18th October 2018****Sebastian Posur (Siegen) **

**TBA**

**25th October 2018****Nathan Ilten-Gee (Vancouver) **

**Deformations of smooth complete toric varieties: obstructions and the cup product**

**Abstract:** Let X be a smooth complete toric variety. I will explicitly describe the obstruction space and the cup product map in combinatorial terms. Using this, I give an example of a smooth projective toric threefolds for which the cup product map does not vanish, showing that in general, smooth complete toric varieties may have obstructed deformations. This is joint work with Charles Turo.

**1st November 2018****Dominic Bunnett (FU Berlin) **

**8th November 2018****NO TALK due to NoGags Leipzig!**

**15th November 2018****Matej Filip (Mainz) **

**22nd November ****Irem Portakal (Magdeburg) **

**29th November 2018****Achim Hennings **

**6th December 2018 **

**13th December 2018****Frederik Witt (Stuttgart)**

**20th December 2018****No talk due to Magdeburg-Kolloquium**

**Forschungsseminar "Algebraische Geometrie" an der HU**