Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Jochen Wengenroth"'
Publikováno v:
Complex Analysis and Operator Theory. 15
Every semigroup $$\{\varphi _t\}_{t\ge 0}$$ of self-maps of the disc defines a semigroup $$\{C_{\varphi _t}\}_{t\ge 0}$$ of compositions operators on the space of holomorphic functions on the disc. We characterize the (uniform) mean ergodicity (in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89c739017be0f28b60e66bd5ee6bf1ed
https://doi.org/10.1007/s11785-021-01105-7
https://doi.org/10.1007/s11785-021-01105-7
Autor:
Jochen Wengenroth, Ludwig von Auer
Various fields of economic analysis (e.g. growth and productivity) and economic policy (e.g. monetary and social policy) rely on accurate measures of price change. Unfortunately, the price index formulae that most price statisticians consider as part
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21694e00d8ea0b10626b88f6f2807dbf
https://hdl.handle.net/10419/233731
https://hdl.handle.net/10419/233731
Publikováno v:
Results in Mathematics. 75
We consider the space of real-valued continuously differentiable functions on a compact subset of a euclidean space. We characterize the completeness of this space and prove that the space of restrictions of continuously differentiable functions on t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4e0ea1638d803efc0cd6a3c3b27d121
https://doi.org/10.1007/s00025-020-01303-3
https://doi.org/10.1007/s00025-020-01303-3
Publikováno v:
RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
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We introduce sufficient as well as necessary conditions for a compact set $K$ such that there is a continuous linear extension operator from the space of restrictions $C^\infty(K)=\lbrace F|_K: F\in C^\infty(\mathbb R)\rbrace$ to $C^\infty(\mathbb R)
Externí odkaz:
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Publikováno v:
Studia Mathematica. :1-10
The diametral dimension is an important topological invariant in the category of Frechet spaces which has been used, e.g., to distinguish types of Stein manifolds. We introduce variants of the classical definition in order to solve an old conjecture
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf16dcf31e7146de36cab313f5936619
https://doi.org/10.4064/sm8597-6-2016
https://doi.org/10.4064/sm8597-6-2016
Publikováno v:
RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
instname
[EN] For a compact set K subset of R-d we characterize the existence of a linear extension operator E: E(K) -> C-infinity (R-d) for the space of Whitney jets E(K) with a certain loss of derivatives sigma, that is, the operator satisfies the following
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44d938405f8af6b36f9c04db8bd428d1
https://doi.org/10.1016/j.jmaa.2020.124142
https://doi.org/10.1016/j.jmaa.2020.124142
Publikováno v:
RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
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We prove that for a strongly continuous semigroup T on the Frechet space omega of all scalar sequences, its generator is a continuous linear operator A is an element of L(omega) and that, for all x is an element of omega and t >= 0, the series exp(tA
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0924cdcae93414d813068f75f6eb5ca7
https://doi.org/10.1016/j.jmaa.2013.10.053
https://doi.org/10.1016/j.jmaa.2013.10.053
Publikováno v:
RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
instname
[EN] For a compact set K subset of R-d we characterize the existence of a linear extension operator E: E (K) -> C-infinity(R-d) for the space of Whitney jets E (K) without loss of derivatives, that is, it satisfies the best possible continuity estima
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61a4f7bf49d94b33442791c8d0a0f69e
http://hdl.handle.net/10251/82874
http://hdl.handle.net/10251/82874
Autor:
Jochen Wengenroth
Publikováno v:
Journal of Pure and Applied Algebra. 216:1700-1703
We show that a conjecture of Raĭkov from category theory fails for simple reasons which reflect very concrete properties of, for example, partial differential operators.
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66538d028176abade011d1590dbaf216
https://doi.org/10.1016/j.jpaa.2012.01.007
https://doi.org/10.1016/j.jpaa.2012.01.007
Autor:
Jochen Wengenroth
Publikováno v:
Journal of Mathematical Analysis and Applications. 379:719-723
We characterize the surjectivity of a linear partial differential operator with constant coefficients on E ( Ω ) as well as on D ′ ( Ω ) in terms of the existence of “good” shifted fundamental solutions. This characterization complements resu
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5af01f23dc1a777f189905a43ba0fd78
https://doi.org/10.1016/j.jmaa.2011.01.074
https://doi.org/10.1016/j.jmaa.2011.01.074