By Benjamin Fine

ISBN-10: 0824703197

ISBN-13: 9780824703196

A survey of one-relator items of cyclics or teams with a unmarried defining relation, extending the algebraic examine of Fuchsian teams to the extra basic context of one-relator items and comparable workforce theoretical issues. It presents a self-contained account of definite normal generalizations of discrete teams.

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**Additional info for Algebraic Generalizations of Discrete Groups: A Path to Combinatorial Group Theory Through One-Relator Products**

**Example text**

K 2 = (771)*K 2 . Hence the Verdier dual of K 3 (is up to shift and a twist) K 3 itself, with t/! -l. 1) By the definition of the intersection cohomology complex, it will be enough to check that the i-th cohomology sheaf J*
*

17). 12 holds for w and L. Next, we assume that s < WL n. Then sL = L® L:nt where t is an ' integer. Since G is assumed to have simply-connected derived subgroup, the homomorphism as : 3: -> Z is surjective. Hence there exists L 1 < 3: such that sL 1 = L 1 ®L:(-t) Then s(L®L~'n) = L®L~n. 12 for (L® L~n, w). Thus, we are reduced to the case where sL = L. By the induction hypothesis, we have [p] -f(w v )-1 ~L 1 1 wl vl "1. ,l/J -1 1. 19 (i)). 11, are proved. 21. 1). We shall define a subset '1 , of '1(T).

4 with w' I Z or i odd follow. 4 with w' € Z and i even, before lifting under f*, we use the following remark. Since the locally trivial fibration f: G xk* ->GIB has connected fibers, a constructible Oe-sheaf :f on G/B can be reconstructed from its inverse image f*:f : we have :f = R 0 f *(f*:f). Since f is a locally trivial fibration, the fact that f;(J*
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### Algebraic Generalizations of Discrete Groups: A Path to Combinatorial Group Theory Through One-Relator Products by Benjamin Fine

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