On nonparasite solutions
Krbec, Pavel
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Krbec, Pavel
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Istvan Fary (1965)
Séminaire Ehresmann. Topologie et géométrie différentielle
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David Nualart, Moshe Zakai (1989)
Séminaire de probabilités de Strasbourg
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Wacław Sierpiński (1953)
Fundamenta Mathematicae
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Piotr Pragacz (1988)
Annales scientifiques de l'École Normale Supérieure
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Thomas S. Mountford (1993)
Séminaire de probabilités de Strasbourg
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David Williams (1978)
Séminaire de probabilités de Strasbourg
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Walter Rudin (1975)
Annales de l'institut Fourier
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A simple theorem is proved which states a sufficient condition for the sum ot two closed subspaces of a Banach space to be closed. This leads to several analogues of Sarason’s theorem which states that is a closed subalgebra of . In these analogues, the unit circle is replaces by other groups, and the unit disc is replaced by polydiscs or by balls in spaces of several complex variables. Sums of closed ideals in Banach algebras are also studied.