Quantum Weyl Reciprocity and Tilting Modules
Quantum Weyl Reciprocity and Tilting Modules
复制标题
DOI:
10.1007/s002200050392
复制
发表时间:
1998-07
影响因子:
2.4
通讯作者:
J. Du;B. Parshall;L. Scott
中科院分区:
文献类型:
--
作者:
J. Du;B. Parshall;L. Scott
Quantum Weyl reciprocity relates the representation theory of Hecke algebras of typeAwith that ofq-Schur algebras. This paper establishes that Weyl reciprocity holds integrally (i. e., over the ring ℤ[q, q− 1] of Laurent polynomials) and that it behaves well under base-change. A key ingredient in our approach involves the theory of tilting modules forq-Schur algebras. New results obtained in that direction include an explicit determination of the Ringel dual algebra of aq-Schur algebra in all cases. In particular, in the most interesting situation, the Ringel dual identifies with a natural quotient algebra of the Hecke algebra.