Affine Nash groups over real closed fields

Details Affine Nash groups over real closed fields Affine Nash groups over real closed fields

2011-05-13

arxiv.org/abs/1105.2660v1

Mathematics

Algebraic Geometry

9 pages

Scientific paper

We prove that a semialgebraically connected affine Nash group over a real closed field R is Nash isogenous to the semialgebraically connected component of the group H(R) of R-points of some algebraic group H defined over R. In the case when R is the field of real numbers this result was claimed in the paper "Groups definable in local fields and pseudofinite fields", Israel J. Math. 85 (1994) by the same two authors, but a mistake in the proof was recently found, and the new proof we obtained has the advantage of being valid over an arbitrary real closed field. We also extend the result to not necessarily connected affine Nash groups over arbitrary real closed fields.

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