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Set-partition tableaux and representations of diagram algebras
Halverson, Tom1; Jacobson, Theodore N.2
1 Department of Mathematics Statistics and Computer Science Macalester College Saint Paul MN 55105, USA
2 School of Physics and Astronomy University of Minnesota Minneapolis MN 55455, USA
Algebraic Combinatorics, Volume 3 (2020) no. 2, pp. 509-538.

The partition algebra is an associative algebra with a basis of set-partition diagrams and multiplication given by diagram concatenation. It contains as subalgebras a large class of diagram algebras including the Brauer, planar partition, rook monoid, rook-Brauer, Temperley–Lieb, Motzkin, planar rook monoid, and symmetric group algebras. We construct the irreducible modules of these algebras in three isomorphic ways: as the span of diagrams in a quotient of the left regular representation; as the span of symmetric diagrams on which the algebra acts by conjugation twisted with an irreducible symmetric group representation; and on a basis indexed by set-partition tableaux such that diagrams in the algebra act combinatorially on tableaux. The second representation is analogous to the Gelfand model and the third is a generalization of Young’s natural representation of the symmetric group on standard tableaux. The methods of this paper work uniformly for the partition algebra and its diagram subalgebras. As an application, we express the characters of each of these algebras as nonnegative integer combinations of symmetric group characters whose coefficients count fixed points under conjugation.

Received:
Revised:
Accepted:
Published online:
DOI: 10.5802/alco.102
Classification: 05E10, 05E18, 20C15
Keywords: Set partitions, tableaux, partition algebra, symmetric group, Brauer algebra, Temperley–Lieb algebra, Motzkin algebra, Rook monoid.

Halverson, Tom 1; Jacobson, Theodore N. 2

1 Department of Mathematics Statistics and Computer Science Macalester College Saint Paul MN 55105, USA
2 School of Physics and Astronomy University of Minnesota Minneapolis MN 55455, USA
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights 
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Halverson, Tom; Jacobson, Theodore N. Set-partition tableaux and representations of diagram algebras. Algebraic Combinatorics, Volume 3 (2020) no. 2, pp. 509-538. doi : 10.5802/alco.102. https://alco.centre-mersenne.org/articles/10.5802/alco.102/

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