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比利时vs摩洛哥足彩 ,
university of california san diego

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topology colloquium

daniel biss

university of chicago

$k_g$ 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.

host: nitya kitchloo

december 7, 2005

2:00 pm

ap&m 6218

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