Integrated Semigroups and Integrodifferential Equations.
Ralph deLaubenfels (1990)
Mathematische Zeitschrift
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Ralph deLaubenfels (1990)
Mathematische Zeitschrift
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Štefan Schwarz (1951)
Czechoslovak Mathematical Journal
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Marta Tyran-Kamińska (2009)
Studia Mathematica
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We provide sufficient conditions for sums of two unbounded operators on a Banach space to be (pre-)generators of contraction semigroups. Necessary conditions and applications to positive emigroups on Banach lattices are also presented.
Marek Ptak (1991)
Annales Polonici Mathematici
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Abstract. We consider the reflexivity of a WOT-closed algebra generated by continuous isometric semigroups parametrized by the semigroup of non-negative reals or the semigroup of finite sequences of non-negative reals. It is also proved that semigroups of continuous unilateral multi-parameter shifts are reflexive.
Adam Bobrowski (1998)
Annales Polonici Mathematici
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Convergence of semigroups which do not converge in the Trotter-Kato-Neveu sense is considered.
Enrico Priola (1999)
Studia Mathematica
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We study a new class of Markov type semigroups (not strongly continuous in general) in the space of all real, uniformly continuous and bounded functions on a separable metric space E. Our results allow us to characterize the generators of Markov transition semigroups in infinite dimensions such as the heat and the Ornstein-Uhlenbeck semigroups.
E. D. DeVun (1980)
Semigroup forum
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Dariush Heidari, Marzieh Amooshahi (2013)
Discussiones Mathematicae - General Algebra and Applications
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The concept of Γ-semigroups is a generalization of semigroups. In this paper, we associate two transformation semigroups to a Γ-semigroup and we call them the left and right transformation semigroups. We prove some relationships between the ideals of a Γ-semigroup and the ideals of its left and right transformation semigroups. Finally, we study some relationships between Green's equivalence relations of a Γ-semigroup and its left (right) transformation semigroup.
J.M.A.M. van Neerven (1993)
Mathematische Zeitschrift
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P.S. VENKATESAN (1969)
Mathematische Annalen
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Alberto Frigerio, Maurizio Verri (1982)
Mathematische Zeitschrift
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