On automorphisms of arithmetic subgroups of unipotent groups in positive characteristic

Details On automorphisms of arithmetic subgroups of unipotent groups in positive characteristic On automorphisms of arithmetic subgroups of unipotent groups in positive characteristic

2000-07-20

arxiv.org/abs/math/0007127v1

Mathematics

Group Theory

Latex2e file, 20 pages, no figures

Scientific paper

Let F be a local field of positive characteristic, and let G be either a
Heisenberg group over F, or a certain (nonabelian) two-dimensional unipotent
group over F. If H is an arithmetic subgroup of G, we provide an explicit
description of every automorphism of H. From this description, it follows that
every automorphism of H virtually extends to a virtual automorphism of G.

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