Event Type:

Number Theory Seminar

Date/Time:

Tuesday, January 13, 2015 - 16:00 to 17:00

Location:

Kidder 350

Local Speaker:

Abstract:

Given a global field K, we characterize those automorphisms of P^n defined over K which induce isometries of P^n over all places of K. The answer is that only the obvious examples actually occur. The proof uses linear algebra and the theory of heights.