Department of

# Mathematics

Seminar Calendar
for events the day of Wednesday, July 12, 2017.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Wednesday, July 12, 2017

2:00 pm in 443 Altgeld Hall,Wednesday, July 12, 2017

#### Rational curves in log K3 surfaces

###### Michel van Garrel (University of Hamburg)

Abstract: I will address the basic question of how to count rational curves in the log K3 surfaces that arise in type II degenerations. I will give a full conjectural description of these counts in terms of local BPS state counts, and present some partial results towards that conjecture. This is based on joint work with J. Choi, N. Takahashi and S. Katz.