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pro vyhledávání: '"Kreulich Josef"'
Autor:
Kreulich, Josef
This study uses the ideas of \cite{Rieffel} to provide the dual of $L^1(\mu,X)$ in the positive and $\sigma-$ finite cases. This results in elegant necessary and sufficient criteria for weak compactness in $L^1(S,\mu,X)$ in the $\sigma-$finite case,
Externí odkaz:
http://arxiv.org/abs/2101.06659
Autor:
Kreulich, Josef
The given study uses the methods to identify compactifications of semigroups $S\subset L(X),$ which reside in the space $L(X).$ This method generalizes in some sense the deLeeuw-Glicksberg-Theory to a greater class of functions. The approach provides
Externí odkaz:
http://arxiv.org/abs/2005.13006
Autor:
Kreulich, Josef
In this study, we refine the compactification presented by Witz \cite{Witz} for general semigroups to the case of bounded $C_0$-semigroups, involving adjoint theory for this class of operators. This approach considerably reduces the operator space in
Externí odkaz:
http://arxiv.org/abs/1808.04833
Autor:
Kreulich, Josef
It is shown how the linear method of the Yosida-approximation of the derivative applies to solve possibly nonlinear abstract functional differential equations in both, the finite and infinite delay case. A generalization of the integral solution will
Externí odkaz:
http://arxiv.org/abs/1702.08028
Autor:
Kreulich, Josef
In the underlying study it is shown how the linear method of the Yosida-approximation of the derivative applies to solve possibly nonlinear and multivalued functional differential equations like: \begin{eqnarray*} u^\prime(t) &\in& A(t,u_t)u(t) +\ome
Externí odkaz:
http://arxiv.org/abs/1702.08031
Akademický článek
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Autor:
Kreulich, Josef
We show how the approach of Yosida approximation of the derivative serves to obtain new results for evolution systems. Using this method we obtain multivalued time dependent perturbation results. Additionally, translation invariant subspaces $Y$ of t
Externí odkaz:
http://arxiv.org/abs/1312.2931
Autor:
Kreulich Josef
Publikováno v:
Advances in Nonlinear Analysis, Vol 8, Iss 1, Pp 1-28 (2016)
We present sufficient conditions on the existence of solutions, with various specific almost periodicity properties, in the context of nonlinear, generally multivalued, non-autonomous initial value differential equations,
Externí odkaz:
https://doaj.org/article/dfc8ef5b7f8e4190967c42d68d7435c7
Autor:
Kreulich, Josef
Publikováno v:
In Journal of Mathematical Analysis and Applications 15 April 2015 424(2):1054-1102
Akademický článek
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