1981Proceedings of the American Mathematical SocietyOpen access

A note on the factorization of operator-valued functions

Takahiko Nakazi

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Abstract

Devinatz showed the factorization of positive operator valued functions $T({e^{i\theta }})$ such that $\int _0^{2\pi } {\log } {|| {T{{({e^{i\theta }})}^{ - 1}}} ||^{ - 1}}d\theta > - \infty$. The purpose of this note is the factorization in case ${\int _0^{2\pi } {\log || {T{{({e^{i\theta }})}^{ - 1}}} ||} ^{ - 1}}d\theta = - \infty$.

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Devinatz showed the factorization of positive operator valued functions $T({e^{i\theta }})$ such that $\int _0^{2\pi } {\log } {|| {T{{({e^{i\theta }})}^{ - 1}}} ||^{ - 1}}d\theta > - \infty$. The purpose of this note is the factorization in case ${\int _0^{2\pi } {\log || {T{{({e^{i\theta }})}^{ - 1}}} ||} ^{ - 1}}d\theta = - \infty$.

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Available abstract

Devinatz showed the factorization of positive operator valued functions $T({e^{i\theta }})$ such that $\int _0^{2\pi } {\log } {|| {T{{({e^{i\theta }})}^{ - 1}}} ||^{ - 1}}d\theta > - \infty$. The purpose of this note is the factorization in case ${\int _0^{2\pi } {\log || {T{{({e^{i\theta }})}^{ - 1}}} ||} ^{ - 1}}d\theta = - \infty$.

Key concepts: Factorization, Operator (biology), Mathematics, Algebra over a field, Combinatorics, Pure mathematics, Discrete mathematics, Algorithm

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