: Mathématiques: Mautner's lemma

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Mautner's lemma

Mautner's lemma in representation theory, named after Austrian-American mathematician Friederich Mautner, states that if G is a topological group and π a unitary representation of G on a Hilbert space H, then for any x in G, which has conjugates

yxy⁻¹

converging to the identity element e, for a net of elements y, then any vector v of H invariant under all the π(y) is also invariant under π(x).
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Mautner%27s_lemma)

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