Mathematical Proceedings of the Cambridge Philosophical Society

Research Article

A note on the normal subgroups of mapping class groups

D. D. Longa1

a1 University of Southampton

0. If Fg is a closed, orientable surface of genus g, then the mapping class group of Fg is the group whose elements are orientation preserving self homeomorphisms of Fg modulo isotopy. We shall denote this group by Mg. Recall that a group is said to be linear if it admits a faithful representation as a group of matrices (where the entries for this purpose will be in some field).

(Received January 07 1985)

(Revised May 17 1985)