Date: Wed, 15 Nov 1995 13:58:40 -0500 (EST) From: Evelyn HartSubject: A One-Relator Group Dear Group Pub Forum: My research in periodic point theory on the double torus is leading me into combinatorial algebra. What is known about the normal subgroups of the fundamental group of the double torus? (I am really interested in knowing what the homomorphisms from the group to itself can look like.) The group is < a,b,c,d | a*b*a^-1*b^-1*c*d*c^-1*d^-1 >. Thanks for helping a topologist who likes groups. Evelyn Hart % Evelyn Hart | W: 315-824-7736 | % % Colgate Univ., Dept. of Math. | Fax:315-824-7831 | % % 13 Oak Drive | H: 315-824-9069 | % % Hamilton NY 13346-1398 | ehart@colgate.edu| %