An invariant for difference field extensions

Details An invariant for difference field extensions An invariant for difference field extensions

2009-02-05

arxiv.org/abs/0902.0844v4

Mathematics

Logic

After posting the previous version, we discovered the work of Willis on totally disconnected locally compact groups. Over a la

Scientific paper

In this paper we introduce a new invariant (the distant degree) for
difference field extensions of finite transcendence degree, and we explore some
of its properties. We also discuss a generalisation of this invariant and of
the limit degree to groups with an automorphism.

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