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We simplify construction of Thoma representations of an infinite symmetric group

Representation Theory · Mathematics 2013-10-08 Neretin Yury

We give a complete list of indecomposable characters of the infinite symmetric semigroup. In comparison with the analogous list for the infinite symmetric group, one should introduce only one new parameter, which has a clear combinatorial…

Representation Theory · Mathematics 2011-02-23 Anatoly Vershik , Pavel Nikitin

The aim of the present survey paper is to provide an accessible introduction to a new chapter of representation theory - harmonic analysis for noncommutative groups with infinite-dimensional dual space. I omitted detailed proofs but tried…

Representation Theory · Mathematics 2007-05-23 Grigori Olshanski

This paper contains a complete description of classes of the unitary equivalence of the admissible representations of infinite-dimensional classic matrix groups paper.

funct-an · Mathematics 2008-02-03 N. I. Nessonov

In this paper we consider symmetric powers representation and exterior powers representation of finite groups, which generated by the representation which has finite dimension over the complex field. We calculate the multiplicity of…

Representation Theory · Mathematics 2014-05-09 Tomoyuki Tamura

We classify globally irreducible representations of alternating groups and double covers of symmetric and alternating groups. In order to achieve this classification we also completely characterise irreducible representations of such groups…

Representation Theory · Mathematics 2024-10-29 Matthew Fayers , Lucia Morotti

We obtain a complete classification of the continuous unitary representations of oligomorphic permutation groups (those include the infinite permutation group $S_\infty$, the automorphism group of the countable dense linear order, the…

Group Theory · Mathematics 2012-05-21 Todor Tsankov

A group is irreducibly represented if it has a faithful irreducible unitary representation. For countable groups, a criterion for irreducible representability is given, which generalises a result obtained for finite groups by W. Gasch\"utz…

Group Theory · Mathematics 2015-02-04 Bachir Bekka , Pierre de la Harpe

We relate the linear asymptotic representation theory of the symmetric groups to its spin counterpart. In particular, we give explicit formulas which express the normalized irreducible spin characters evaluated on a strict partition $\xi$…

Combinatorics · Mathematics 2020-03-03 Sho Matsumoto , Piotr Śniady

We show the irreducibility of some unitary representations of the group of symplectomorphisms and the group of contactomorphisms.

Representation Theory · Mathematics 2014-04-17 Łukasz Garncarek

We introduce the notion of stable representations, -- it is a new class of the representations of a certain class of groups which defined with positive definite functions which generalize the classical notion of the characters (or trace).…

Functional Analysis · Mathematics 2012-04-03 A. Vershik , N. Nessonov

We discuss implications of the following statement about the representation theory of symmetric groups: every integer appears infinitely often as an irreducible character evaluation, and every nonnegative integer appears infinitely often as…

Combinatorics · Mathematics 2018-01-30 Anshul Adve , Alexander Yong

We classify irreducible unitary representations of the group of all infinite matrices over a $p$-adic field ($p\ne 2$) with integer elements equipped with a natural topology. Any irreducible representation passes through a group $GL$ of…

Representation Theory · Mathematics 2021-08-24 Yury A. Neretin

Many finite groups, including all finite non-abelian simple groups, can be symmetrically generated by involutions. In this paper we give an algorithm to symmetrically represent elements of finite groups and to transform symmetrically…

Group Theory · Mathematics 2007-05-23 Z. Hasan , A. Kasouha

We introduce an algorithm to decompose orthogonal matrix representations of the symmetric group over the reals into irreducible representations, which as a by-product also computes the multiplicities of the irreducible representations. The…

Group Theory · Mathematics 2024-07-24 Sheehan Olver

In this paper we completely classify irreducible tensor products of covering groups of symmetric and alternating groups in characteristic $\not=2$.

Representation Theory · Mathematics 2021-05-10 Lucia Morotti

We prove that there is a one-one correspondence between sets of irreducible representations of a polyadic group and its Post's cover. Using this correspondence, we generalize some well-known properties of irreducible characters in finite…

Representation Theory · Mathematics 2010-11-04 Mohammad Shahryari

Following the general idea of Schur--Weyl scheme and using two suitable symmetric groups (instead of one), we try to make more explicit the classical problem of decomposing tensor representations of finite and infinite symmetric groups into…

Representation Theory · Mathematics 2017-12-20 P. P. Nikitin , N. V. Tsilevich , A. M. Vershik

For any finite group $G$ and any prime $p$ one can ask which ordinary irreducible representations remain irreducible in characteristic $p$. We answer this question for $p=2$ when $G$ is a proper double cover of the symmetric group. Our…

Representation Theory · Mathematics 2024-01-17 Matthew Fayers

We will describe the relationship between the indecomposable characters of the finitary symmetric group and its ergodic invariant random subgroups; and we will interpret each Thoma character as an asymptotic limit of a naturally associated…

Group Theory · Mathematics 2018-12-07 Simon Thomas
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