Mathematics – Functional Analysis
Scientific paper
2004-03-04
Mathematics
Functional Analysis
19 pages
Scientific paper
A multivariate version of Rosenblum's Fejer-Riesz theorem on outer
factorization of trigonometric polynomials with operator coefficients is
considered. Due to a simplification of the proof of the single variable case,
new necessary and sufficient conditions for the multivariable outer
factorization problem are formulated and proved.
Dritschel Michael A.
Woerdeman Hugo J.
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