Difference fields and descent of difference varieties
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If you have a question about this talk, please contact Mustapha Amrani.
Discrete Integrable Systems
In this talk I will state and explain a few results of descent of difference varieties which can be obtained using model theoretic tools.
The typical statement is the following: Let K_1 and K_2 be difference fields, and V_i, i=1,2, difference varieties defined over K_i. Assume that there is a dominant rational difference morphism from V_1 onto V_2.
Then V_2 in turns dominates some difference variety defined over K=K_1p K_2. This result is of course not true as stated, and we explain which hypotheses make it valid. In particular it gives an alternate proof of a result of M. Baker on algebraic dynamics and generalises it to higher dimensions. This is joint work with Ehud Hrushovski.
Extended abstract, at http://www.logique.jussieu.fr/~zoe/papiers/Leeds09.pdf
This talk is part of the Isaac Newton Institute Seminar Series series.
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