U. Haifa Topology & Geometry seminar: Sunday, NOV 28, 2021. Speaker: Jereon Hekking (KTH). “Title:  Graded algebras, projective spectra and blow-ups in derived algebraic geometry”

Time: Sunday November 28th 17:00 (Israel Time)

Location: On Zoom

Speaker: Jereon Hekking (KTH)

Title: Graded algebras, projective spectra and blow-ups in derived algebraic geometry

Recording:

https://us02web.zoom.us/rec/share/Cb6AhzbntZk0ipwpYjRkoAlQNTYyhGOuiY42sSP0AcoSz7i0hacCJNQrrVoqlWw.sOAp1cmjCc-0TKjv

Abstract.

The goal of this talk is to define the derived blow-up of a closed immersion of derived schemes, and to mention a few key properties of this construction. After reviewing derived schemes, we will first introduce the infinity category of graded, simplicial rings as a free completion along sifted colimits, and explain how one takes the derived projective spectrum of such a gadget. We then introduce the derived extended Rees algebra via Weil restrictions, which is the key ingredient for derived blow-ups.

This is based on joint work with Adeel Khan and David Rydh

ZOOM COORDINATES:

https://us02web.zoom.us/j/84987591026?pwd=aTJWcFlOSldKck5leGt2d25CYkRqZz09

Meeting ID: 849 8759 1026

Accessibility