Exotic R^4’s are unclassifiable

Name: Exotic R^4’s are unclassifiable
Start: 2026-03-27T15:00:00+00:00
End: 2026-03-27T17:15:00+00:00
Location: CMSA, 20 Garden St, G10

CMSA FREEDMAN SEMINAR

When: March 27, 2026

3:00 pm - 5:15 pm

Where: CMSA, 20 Garden St, G10

Address: 20 Garden Street, Cambridge, MA 02138, United States

Speaker: Robert Gompf (UT Austin)

We will use descriptive set theory to show that there is a precise sense in which exotic R^4’s are unclassifiable. For other open manifolds, we can reach a much higher level of unclassifiability. This is work in progress with Aristotelis Panagiotopoulos.

Zoom: https://harvard.zoom.us/j/97164933206?pwd=VP5iXOXcFgxNbdyZvspn ILlJR5u6Vo.1