Regular pairs of quadratic forms on odd-dimensional spaces in characteristic 2

Igor Dolgachev, Alexander Duncan

Published 2015-10-23Version 1

We describe a normal form for a smooth intersection of two quadrics in even-dimensional projective space over an arbitrary field of characteristic 2. We use this to obtain a description of the automorphism group of such a variety. As an application, we show that every quartic del Pezzo surface over a perfect field of characteristic 2 has a canonical rational point and, thus, is unirational.