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Dartmouth College

007 Kemeny Hall, 4 pm

Tea 3:30 pm, 300 Kemeny Hall

**Abstract: **
Around the turn of the 20th century, there was a wonderful breakthrough in studying infinite groups
and their group-algebras: Schur-Weyl duality began as a transfer of information from the symmetric
group to the general linear group via commuting actions on a very natural vector space. Since then,
there has been an explosion of developments in tensor power centralizer algebras: algebras rising in duality
with more familiar groups and algebras. Examples include the Brauer algebras, braid groups and quotients thereof,
and tangle algebras. Sometimes we are so lucky as to discover that objects of outside interest also arise in duality with
familiar algebras.

We'll take a brief tour of algebras arising as tensor power centralizer algebras, all of which will be generated by diagrams (like permutation diagrams, braids, tangles, etc.). Then we'll see how an algebra previously arising out of studies of reflection groups, a priori unrelated to centralizer algebras, is in fact a centralizer algebra itself.

This talk will be accessible to graduate students.