The talk is divided in 2 parts, each roughly 45mn with a short break between. The 1st part is for more general audience and the 2nd part is more specialized.

Venue: for in-person attendees (Leonardo da Vinci, Luigi Stasi seminar room).

For virtual attendees:
https://zoom.us/meeting/register/tJUvdumrpjMqH9TgK4-irQa1IZcvBANg3EGF
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Part 1: The Hilbert scheme of points
We introduce the Hilbert scheme of points on surface, and talk about its invariants, its relations to other moduli spaces of sheaves and applications to enumerative geometry. Finally we introduce some techniques for working with these Hilbert schemes

Part 2: (Refined) Verlinde and Segre formulas for Hilbert schemes of pointsuli spaces
This is joint work with Anton Mellit.
Segre and Verlinde numbers of Hilbert schemes of points have been studied for a long time.
The Segre numbers are evaluations of top Chern and Segre classes of so-called tautological bundles on Hilbert schemes of points.
The Verlinde numbers are the holomorphic Euler characteristics of line bundles on these Hilbert schemes.
We give the generating functions for the Segre and Verlinde numbers of Hilbert schemes of points.
The formula is proven for surfaces with K_S^2=0, and conjectured in general. Without restriction on K_S^2 we prove the conjectured Verlinde-Segre correspondence relating Segre and Verlinde numbers of Hilbert schemes. Finally we find a generating function for finer invariants, which specialize to both the Segre and Verlinde numbers, giving some kind of explanation of the Verlinde-Segre correspondence.