Sobolev lifting over invariants
In: https://hal.archives-ouvertes.fr/hal-02536241 ; 2020, 2020
report
Zugriff:
32 pages ; We prove lifting theorems for complex representations $V$ of finite groups $G$. Let $\sigma=(\sigma_1,\ldots,\sigma_n)$ be a minimal system of homogeneous basic invariants and let $d$ be their maximal degree. We prove that any continuous map $\bar f : \mathbb R^m \to V$ such that $f = \sigma \circ \bar f$ is of class $C^{d-1,1}$ is locally of Sobolev class $W^{1,p}$ for all $1 \le p < d/(d-1)$. In the case $m=1$ there always exists a continuous choice $\bar f$ for given $f : \mathbb R \to \sigma(V) \subseteq \mathbb C^n$. We give uniform bounds for the $W^{1,p}$-norm of $\bar f$ in terms of the $C^{d-1,1}$-norm of $f$. The result is optimal: in general a lifting $\bar f$ cannot have a higher Sobolev regularity and it even might not have bounded variation if $f$ is in a larger H\"older class.
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Sobolev lifting over invariants
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Autor/in / Beteiligte Person: | Parusiński, Adam ; Rainer, Armin ; Laboratoire Jean Alexandre Dieudonné (JAD) ; Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (. - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS) ; Wien, Universität ; ANR-17-CE40-0023,LISA,Géométrie Lipschitz des singularités(2017) |
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Zeitschrift: | https://hal.archives-ouvertes.fr/hal-02536241 ; 2020, 2020 |
Veröffentlichung: | HAL CCSD, 2020 |
Medientyp: | report |
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