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In mathematics, a locally compact topological group G has property (T) if the trivial representation is an isolated point in its unitary dual equipped with the Fell topology. Informally, this means that if G acts unitarily on a Hilbert space and has "almost invariant vectors", then it has a nonzero invariant vector. The formal definition, introduced by David Kazhdan (), gives this a precise, quantitative meaning.

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  • Kazhdan's property (T)
  • Propriété (T) de Kazhdan
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  • En mathématiques, et plus précisément en théorie des groupes topologiques, un groupe localement compact est réputé avoir la propriété (T) ou propriété de Kazhdan si chacune de ses représentations unitaires ayant « presque » des vecteurs invariants possède un vecteur invariant non nul. Cette propriété, formalisée par David Kazhdan en 1967, peut être vue comme opposée à la moyennabilité.
  • In mathematics, a locally compact topological group G has property (T) if the trivial representation is an isolated point in its unitary dual equipped with the Fell topology. Informally, this means that if G acts unitarily on a Hilbert space and has "almost invariant vectors", then it has a nonzero invariant vector. The formal definition, introduced by David Kazhdan (), gives this a precise, quantitative meaning.
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