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Numerical-symbolic exact irreducible decomposition of cyclic-12

Published online by Cambridge University Press:  01 August 2011

Rostam Sabeti*
Affiliation:
Department of Mathematics, Michigan State University, East Lansing, MI 48824-1027, USA (email: sabetiro@math.msu.edu)

Abstract

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In 1992, Göran Björck and Ralf Fröberg completely characterized the solution set of cyclic-8. In 2001, Jean-Charles Faugère determined the solution set of cyclic-9, by computer algebra methods and Gröbner basis computation. In this paper, a new theory in matrix analysis of rank-deficient matrices together with algorithms in numerical algebraic geometry enables us to present a symbolic-numerical algorithm to derive exactly the defining polynomials of all prime ideals of positive dimension in primary decomposition of cyclic-12. Empirical evidence together with rigorous proof establishes the fact that the positive-dimensional solution variety of cyclic-12 just consists of 72 quadrics of dimension one.

Type
Research Article
Copyright
Copyright © London Mathematical Society 2011

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