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Mat. Zametki, 2007 Volume 82, Issue 3, Pages 383–389 (Mi mzm3841)

Nonstandard Representations of Locally Compact Groups

V. A. Lyubetskii, S. A. Pirogov

Institute for Information Transmission Problems, Russian Academy of Sciences

Abstract: In the note, it is proved that, under natural conditions, any infinite-dimensional unitary representation $T$ of a direct product of groups $G=K\times N$, where $K$ is a compact group and $N$ is a locally compact Abelian group, is imaged by a representation of the nonstandard analog $\widetilde G$ of the group $G$ in the group of nonstandard matrices of a fixed nonstandard size.

Keywords: unitary representation, nonstandard matrix, imaging of groups, Boolean algebra, Stone space, Casimir operator.

UDC: 510.225

Received: 29.11.2005
Revised: 29.01.2007

DOI: 10.4213/mzm3841


 English version:
Mathematical Notes, 2007, 82:3, 341–346

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© Steklov Math. Inst. of RAS, 2025