Results 31 to 40 of about 73 (67)
Open MathematicsA family of commuting contraction semigroups (Pn(t))n∈N{\left({P}_{n}\left(t))}_{n\in {\mathbb{N}}}, defined on l1(N){l}^{1}\left({\mathbb{N}}), is presented. For this family, the product semigroup ∏n=1∞Pn(t){\prod }_{n=1}^{\infty }{P}_{n}\left(t) exists
Nieznaj Ernest
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On a Product Formula for Unitary Groups [PDF]
, 2017 For any nonnegative self-adjoint operators A and B in a separable Hilbert space, the Trotter-type formula [(ei2tA/n+ei2tB/n)/2]n is shown to converge strongly in the norm closure of dom (A1/2) ∩ dom (B1/2 for some subsequence and for almost every t ∈ R ...
Cachia, V.
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On existence of subspace codiskcyclicity for C 0-semigroups
Concrete OperatorsThis study explores the concept of subspace codiskcyclicity within the framework of C 0-semigroups, introducing it as a natural generalization of subspace-diskcyclicity.
Slaa Peter Masong +2 more
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, 2002 We prove some spectral inclusions for strongly continuous semigroups. Some sta-bility results are also established. 2000 Mathematics Subject Classification: 47D03, 47A10. 1. Introduction and preliminaries.
Abdelkader Elkoutri, Mohamed Aziz Taoudi
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A Lower Bound for the Differences of Powers of Linear Operators
, 2008 Let T be a bounded linear operator in a Banach space, with σ(T) = {1}. In 1983, Esterle–Berkani ’ s conjecture was proposed for the decay of differences (I − T) T n as follows: Either lim infn→ ∞ (n + 1) (I − T) T n ≥ 1/e or T = I.
V. Turunen +3 more
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On the unboundedness of control operators for bilinear systems
, 2003 The aim of this work is to study the classes of unbounded linear control operators which ensure the existence and uniqueness of the mild and strong solutions of certain bilinear control systems.
Idrissi, Abdelalli
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Age-Structured SIR Model for the Spread of Infectious Diseases Through Indirect Contacts. [PDF]
Mediterr J Math, 2022 Kumar M, Abbas S.
europepmc +1 more source
A Remark on C -Dynamical Systems in Hilbert C -modules
, 2007 In this paper we consider C 0 -group of unitary operators on a Hilbert C -module E. In particular we show that if A ⊆ L(E) is a C -algebra including K(E) and there is x ∈ E with < x, x >= 1 and if α t is a C -dynamics on A with generator δ and θ x ...
Hassani@mshdiau Ac Ir +2 more
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, 2001 Let (U(t))t≥0 be a C0-semigroup of bounded linear operators on a Banach space X. In this paper, we establish that if, for some t0> 0, U(t0) is a Fredholm (resp., semi-Fredholm) operator, then (U(t))t≥0 is a Fredholm (resp., semi-Fredholm) semi-group ...
Khalid Latrach, Abdelkader Dehici
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Mathematics Subject Classification: Primary 43A07, 43A60, 46L89, 47D03; Secondary 22D25
, 2010 We propose a definition of a "C * -Eberlein" algebra, which is a weak form of a C * -bialgebra with a sort of "unitary generator".
Matthew Daws, Biswarup Das
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