Finite separating sets and quasi-affine quotients

Details Finite separating sets and quasi-affine quotients Finite separating sets and quasi-affine quotients

2011-02-10

arxiv.org/abs/1102.2132v2

Mathematics

Commutative Algebra

I corrected typos and fixed the proof of Lemma 5.3, 11 pages

Scientific paper

Nagata's famous counterexample to Hilbert's fourteenth problem shows that the ring of invariants of an algebraic group action on an affine algebraic variety is not always finitely generated. In some sense, however, invariant rings are not far from affine. Indeed, invariant rings are always quasi-affine, and there always exist finite separating sets. In this paper, we give a new method for finding a quasi-affine variety on which the ring of regular functions is equal to a given invariant ring, and we give a criterion to recognize separating algebras. The method and criterion are used on some known examples and in a new construction.

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