By Charles F. Miller III (auth.), Gilbert Baumslag, Charles F. Miller III (eds.)

The papers during this quantity are the results of a workshop held in January 1989 on the Mathematical Sciences study Institute. issues lined contain selection difficulties, finitely offered easy teams, combinatorial geometry and homology, and automated teams and comparable subject matters.

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Since the word problem for U is unsolvable, it follows that the conjugacy problem for G is unsolvable. In one direction this claim is easy. For observe that U is the homomorphic image of G obtained by mapping each 8i in G to the corresponding 8i in U and mapping all other generators to the identity lu. Denote this homomorphism by ¢. Then if y-1qwy =c q it follows that ¢(y)-l w¢(y) =u 1 and hence w =u 1. For the converse, suppose w =u 1. Then r W =u II X k (8i)-1 Rj~Xk(8i) k=l for suitable words X k in the given generators.

For since G is finitely generated, the entries in its matrices all lie in some finitely generated commutative ring. Now the arithmetic of such a ring is effective and hence such a group has solvable word problem (see [11]). In the group 8L(2, Z) the two matrices (~ i) and (; ~) freely generate a free subgroup of rank 2. Moreover, Sanov [93] has shown that an arbirtary 2 x 2 matrix with integer entries belongs to this subgroup if and only if the following three arithmetic conditions are satisfied: (1) ad - be = 1 (2) a and d are congruent to 1 mod 4 (3) e and b are even.

Then Dehn's conjugacy algorithm solves the conjugacy problem for G. Thus Dehn's algorithm for the word problem always implies that Dehn's conjugacy algorithm solves the conjugacy problem. In terms of R-diagrams this means the following: if the number of regions in a R-diagram which is a disk is bounded by a linear function of the length of the boundary, then the same is true of annular R-diagrams. F. Miller Automatic groups: The notion of an automatic group was introduced in [26]. Another reference is [17].