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Preprint Number 171

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171. Zoé Chatzidakis, Ehud Hrushovski
An invariant for difference field extensions
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Submission date: 6 February 2009.


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.

Mathematics Subject Classification: 5B10, 12H10, 39A05

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