A criterion for the strong continuity of representations of topological groups in reflexive Fr\'echet spaces, Shtern A.Iстатья
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Дата последнего поиска статьи во внешних источниках: 8 октября 2025 г.
Аннотация:We obtain some necessary and sufficient conditions for the strong continuity of representations of topological groups in reflexive Fr´echet spaces. In particular, we show that a representation $\pi$ of a topological group $G$ in a reflexive Fr´ echet space $E$ is continuous in the strong operator topology if and only if for some number $q$, $0 ⩽ q < 1$, and some neighbourhood $V$ of the identity element $e\in G$, for any neighbourhood $U$ of the zero element in $E$, its polar and any element $f$ of the polar of $U$ in the dual space $E^∗$, and any vector $\xi\in U$, the inequality $|f(\pi(g)\xi − \xi)| ⩽ q$ holds for all $g\in V$.