# Events for 02/18/2021 from all calendars

## Student/Postdoc Working Geometry Seminar

**Time: ** 9:30PM - 10:30PM

**Location: ** zoom

**Speaker: **JM Landsberg, TAMU

**Title: ***Gauss maps and secant varieties via differential geometry I*

**Abstract: **This will be a sequence of 2 expository talks on Gauss maps and secant varieties. After a brief history, I'll give the proofs that (i) projective varieties with degenerate Gauss maps are singular (ii) Zak's theorem on tangencies, (iii) Zak's theorem on linear normailty, (iv) interesting tensors associated to varieties with degenerate secant varieties. The talks will also serve as an introduction to the moving frame.