Algebra and geometry online seminar 16-04-2021

[Francesco Galuppi]

Dear colleagues,

this is to advertise the weekly seminar of the Algebra and geometry 
group of University of Trieste. On Friday, April 16th at 10:30, Elisa 
Postinghel (University of Trento) will talk about "Weyl cycles on 
blow-ups of projective 4-spaces".

We introduce the definition of Weyl cycles on the blow-up X of P^n in a 
collection of points in general position. These are irreducible 
components of the intersection of pairwise orthogonal effective divisors 
on X that live in the Weyl orbit of exceptional divisors, where the 
orthogonality is taken with respect to a Dolgachev-Mukai pairing on the 
Picard group of X. In the case where X is a Mori dream space of 
dimension four or less, we can describe the geometry of and classify 
these objects. I will also explain how this relates to certain 
polynomial interpolation problems.
This is joint work with M. C. Brambilla and O. Dumitrescu.

The seminar will take place online. The Zoom link is 
https://us02web.zoom.us/j/87239350702.

You are welcome to extend the invitation to anyone interested.