Jerusalem Mathematics Colloquium

Thursday, 15th December 2005, 4:00 pm
Mathematics Building, Lecture Hall 2

Daniel Biss

"K_g is not finitely generated"

Abstract: In joint work with Benson Farb, we show that K_g, a certain subgroup of the mapping class group of a genus g surface, is not finitely generated. K_g is the group generated by Dehn twists about null-homologous (separating) curves; it is also known as the kernel of the Johnson homomorphism out of the Torelli group. No background will be assumed.

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

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