Normal subgroups of surface groups?

From: James Jiwi (James_Jiwi_at_hotmail.com)
Date: 10/26/04 

Date: Tue, 26 Oct 2004 14:00:10 +0000 (UTC)

Let G be a surface group, and H be a non-trivial normal subgroup of G.
How can I prove that H is of finite index in G ?
(This is a conjecturally true for any one-relator group)

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