Some condensation theorems for semigroup operators.
Oleg V. Davydov (1993)
Manuscripta mathematica
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Oleg V. Davydov (1993)
Manuscripta mathematica
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Frank Geshwind, Nets Hawk Katz (1997)
The journal of Fourier analysis and applications [[Elektronische Ressource]]
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Bogdanović, Stojan, Imreh, Balázs (1999)
Novi Sad Journal of Mathematics
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J.M.A.M. van Neerven (1991)
Semigroup forum
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Gogodze, Ioseb K., Gelashvili, Koba N. (1997)
Memoirs on Differential Equations and Mathematical Physics
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Peter G. Cazassa, Ole Christensen (1997)
The journal of Fourier analysis and applications [[Elektronische Ressource]]
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Peter M. Higgins (1988)
Colloquium Mathematicae
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Daniel W. Stroock (1998)
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S. Lajos (1965)
Matematički Vesnik
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M.S. Riveros, L. de Rosa, A. de de Torre (2000)
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C.E. Gutiérrez, C. Segovia (1995)
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P. A. Meyer (1982)
Recherche Coopérative sur Programme n°25
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Piotr Budzyński, Jan Stochel (2007)
Studia Mathematica
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Joint subnormality of a family of composition operators on L²-space is characterized by means of positive definiteness of appropriate Radon-Nikodym derivatives. Next, simplified positive definiteness conditions guaranteeing joint subnormality of a C₀-semigroup of composition operators are supplied. Finally, the Radon-Nikodym derivatives associated to a jointly subnormal C₀-semigroup of composition operators are shown to be the Laplace transforms of probability measures (modulo a C₀-group...
T. Niedbalska (1978)
Colloquium Mathematicae
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Mridul K. Sen, Sumanta Chattopadhyay (2008)
Discussiones Mathematicae - General Algebra and Applications
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Let S = {a,b,c,...} and Γ = {α,β,γ,...} be two nonempty sets. S is called a Γ -semigroup if aαb ∈ S, for all α ∈ Γ and a,b ∈ S and (aαb)βc = aα(bβc), for all a,b,c ∈ S and for all α,β ∈ Γ. In this paper we study the semidirect product of a semigroup and a Γ-semigroup. We also introduce the notion of wreath product of a semigroup and a Γ-semigroup and investigate some interesting properties of this product.