On Exponents in Arithmetical Semigroups.
Stefan Porubsky (1977)
Monatshefte für Mathematik
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Stefan Porubsky (1977)
Monatshefte für Mathematik
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V. A. Babalola, A. Olubummo (1974)
Colloquium Mathematicae
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Z. Hedrlin, A. Pultr (1964)
Monatshefte für Mathematik
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Sheng Wang Wang (2002)
Studia Mathematica
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Motivated by a great deal of interest recently in operators that may not be densely defined, we deal with regularized semigroups and integrated semigroups that are either not exponentially bounded or not defined on [0,∞) and generated by closed operators which may not be densely defined. Some characterizations and related examples are presented. Our results are extensions of the corresponding results produced by other authors.
J.A. Goldstein, R. de de Laubenfels, J.T. Sandefur (1993)
Monatshefte für Mathematik
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Z. Hedrlin, A. Pultr (1965)
Monatshefte für Mathematik
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Christian Berg, Zoltán Sasvári (1989)
Monatshefte für Mathematik
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Jürgen Voigt (1989)
Semigroup forum
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Rudolf Lidl, Winfried B. Müller (1986)
Monatshefte für Mathematik
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Elisabetta M. Mangino, Alfredo Peris (2011)
Studia Mathematica
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We study frequent hypercyclicity in the context of strongly continuous semigroups of operators. More precisely, we give a criterion (sufficient condition) for a semigroup to be frequently hypercyclic, whose formulation depends on the Pettis integral. This criterion can be verified in certain cases in terms of the infinitesimal generator of the semigroup. Applications are given for semigroups generated by Ornstein-Uhlenbeck operators, and especially for translation semigroups on weighted...
R.K.S. Rathore, O.P. Singh (1981)
Monatshefte für Mathematik
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B.P. Duggal (1988)
Monatshefte für Mathematik
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H.L. Chow (1976)
Monatshefte für Mathematik
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