Title

On matrix valued square integrable positive definite functions

Document Type

Article

Publication Date

7-12-2015

Abstract

In this paper, we study matrix valued positive definite functions on a unimodular group. We generalize two theorems of Godement on L2 positive definite functions. We show that a matrix-valued continuous L2 positive definite function can always be written as the convolution of a matrix-valued L2 positive definite function with itself. We also prove that, given two L2 matrix valued positive definite functions (Formula presented.). In addition this integral equals zero if and only if Φ∗Ψ=0. Our proofs are operator-theoretic and independent of the group.

Publication Source (Journal or Book title)

Monatshefte fur Mathematik

First Page

437

Last Page

449

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