# Jerusalem Mathematics Colloquium

יום חמישי, כ' באייר, תשס"ג

Thursday, 22nd May 2003, 4:00 pm

Mathematics Building, Lecture Hall 2

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Professor Gus Lehrer

(Sydney)

"Cellular algebras, diagram algebras and affine Hecke algebras"

** Abstract: ** Cellular structure may be used to study the representation
theory of non-semisimple algebras which are deformations of semisimple ones.
I shall show how this technique may be applied to affine Temperley-Lieb algebras,
and how this leads to the determination of certain decomposition numbers
for standard modules of affine Hecke algebras. These numbers have alternative
descriptions in terms of perverse sheaves on certain algebraic varieties.

Light refreshments will be served in the faculty lounge at 3:30.

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