[GRAW02] Chevalley’s Theorem on constructible images made constructive

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Speaker(s)	Mohamed Barakat Universität Siegen
Date	30 January 2020 – 09:10 to 10:00
Venue	INI Seminar Room 1
Session Title	Chevalley’s Theorem on constructible images made constructive
Event	[GRAW02] Computational and algorithmic methods
Abstract	Chevalley proved that the image of an algebraic morphism between algebraic varieties is a constructible set. Examples are orbits of algebraic group actions. A constructible set in a topological space is a finite union of locally closed sets and a locally closed set is the difference of two closed subsets. Simple examples show that even if the source and target of the morphism are affine varieties the image may neither be affine nor quasi-affine. In this talk, I will present a Gröbner-basis-based algorithm that computes the constructible image of a morphism of affine spaces, along with some applications.

Chevalley’s Theorem on constructible images made constructive

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