# On the trigonometric moment problem in two dimensions

- Authors
- Journal
- Indagationes Mathematicae 0019-3577
- Publisher
- Elsevier
- Volume
- 23
- Issue
- 4
- Identifiers
- DOI: 10.1016/j.indag.2012.09.003
- Keywords
- Disciplines

## Abstract

Abstract A finite sequence c0,…,ck of complex numbers is the set of trigonometric moments of a measure dμ=∣Pk(eiθ)∣−2dθ with Pk(z) a polynomial of degree k, zero-free in |z|≤1, providing only that the Hermitian Toeplitz matrix having c0,…,ck as its top row is positive-definite. The analogous representation in two dimensions for a rectangular array of numbers requires additional conditions, discovered by J.S. Geronimo and H.J. Woerdeman. We use orthogonal decomposition to give an alternate proof of their important result.

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