The Euler characteristic of the Whitehead automorphism group of a free product

Details The Euler characteristic of the Whitehead automorphism group of a free product The Euler characteristic of the Whitehead automorphism group of a free product

2006-01-28

arxiv.org/abs/math/0601694v1

Mathematics

Group Theory

19 pages, 3 figures, to appear in Trans. Amer. Math. Soc

Scientific paper

A combinatorial summation identity over the lattice of labelled hypertrees is
established that allows one to gain concrete information on the Euler
characteristics of various automorphism groups of free products of groups.

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