Topology of Injective Endomorphisms of Real Algebraic Sets

Details Topology of Injective Endomorphisms of Real Algebraic Sets Topology of Injective Endomorphisms of Real Algebraic Sets

2002-11-25

arxiv.org/abs/math/0211384v1

Mathematics

Algebraic Geometry

16 pages, AMS-Latex

Scientific paper

Using only basic topological properties of real algebraic sets and regular morphisms we show that any injective regular self-mapping of a real algebraic set is surjective. Then we show that injective morphisms between germs of real algebraic sets define a partial order on the equivalence classes of these germs divided by continuous semi-algebraic homeomorphisms. We use this observation to deduce that any injective regular self-mapping of a real algebraic set is a homeomorphism. We show also a similar local property. All our results can be extended to arc-symmetric semi-algebraic sets and injective continuous arc-symmetric morphisms, and some results to Euler semi-algebraic sets and injective continuous semi-algebraic morphisms.

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