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- W3104785212 abstract "In this paper, we explore the use of path idempotents for the Hecke algebra of type $A$ at roots of unity. For $q$ a primitive $ell$-th root of unity we obain a non-unital imbedding of (a quotient of) the group algebra of $S_m$ into (a quotient of) the Hecke algebra $H_n(q)$ for certain $m$ and $n$. From this we recover certain instances of irreducibility criteria of Dipper, James, and Mathas, and we derive estimates on the decomposition numbers for the Hecke algebra at roots of unity. The bounds are easily computed, provide a good geometric picture of the pairs of diagrams $lambda$, $mu$ for which the decomposition number $d_{lambda, mu}$ is non-zero, and also appers to be a useful adjunct to the exact computation of the decomposition numbers." @default.
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- W3104785212 date "1996-10-01" @default.
- W3104785212 modified "2023-09-26" @default.
- W3104785212 title "Iwahori-Hecke algebras of type A at roots of unity" @default.
- W3104785212 hasPublicationYear "1996" @default.
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