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Constructing Gröbner bases for Noetherian rings†

Published online by Cambridge University Press:  08 October 2013

HERVÉ PERDRY
Affiliation:
Université Paris-Sud UMR-S 669 and INSERM U 669, Villejuif F–94817, France Email: perdry@vjf.inserm.fr
PETER SCHUSTER
Affiliation:
Department of Pure Mathematics, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom Email: pschust@maths.leeds.ac.uk
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Abstract

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We give a constructive proof showing that every finitely generated polynomial ideal has a Gröbner basis, provided the ring of coefficients is Noetherian in the sense of Richman and Seidenberg. That is, we give a constructive termination proof for a variant of the well-known algorithm for computing the Gröbner basis. In combination with a purely order-theoretic result we have proved in a separate paper, this yields a unified constructive proof of the Hilbert basis theorem for all Noether classes: if a ring belongs to a Noether class, then so does the polynomial ring. Our proof can be seen as a constructive reworking of one of the classical proofs, in the spirit of the partial realisation of Hilbert's programme in algebra put forward by Coquand and Lombardi. The rings under consideration need not be commutative, but are assumed to be coherent and strongly discrete: that is, they admit a membership test for every finitely generated ideal. As a complement to the proof, we provide a prime decomposition for commutative rings possessing the finite-depth property.

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Copyright © Cambridge University Press 2013