On positive Matrices which have a Positive Smith Normal Form

Details On positive Matrices which have a Positive Smith Normal Form On positive Matrices which have a Positive Smith Normal Form

2009-09-08

arxiv.org/abs/0909.1482v1

Mathematics

Rings and Algebras

Scientific paper

It is known that any symmetric matrix $M$ with entries in $\R[x]$ and which is positive semi-definite for any substitution of $x\in\R$, has a Smith normal form whose diagonal coefficients are constant sign polynomials in $\R[x]$. We generalize this result by considering a symmetric matrix $M$ with entries in a formally real principal domain $A$, we assume that $M$ is positive semi-definite for any ordering on $A$ and, under one additionnal hypothesis concerning non-real primes, we show that the Smith normal of $M$ is positive, up to association. Counterexamples are given when this last hypothesis is not satisfied. We give also a partial extension of our results to the case of Dedekind domains.

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