Title:  K_g is not finitely generated
Authors:  Daniel Biss and Benson Farb
Author's email addresses:  daniel@math.uchicago.edu, farb@math.uchicago.edu 
Included files:  curve1.eps and curve3.eps
Abstract:  We prove that for any genus g>1, the subgroup K_g of the
mapping class group of a closed genus g surface generated by Dehn
twists about separating curves is not finitely generated.