Graphs, free groups and the Hanna Neumann conjecture

Details Graphs, free groups and the Hanna Neumann conjecture Graphs, free groups and the Hanna Neumann conjecture

2007-01-08

arxiv.org/abs/math/0701214v2

J. Group Theory 11(6) (2008), 885-899

Mathematics

Group Theory

J. Group Theory (to appear)

Scientific paper

A new bound for the rank of the intersection of finitely generated subgroups
of a free group is given, formulated in topological terms, and very much in the
spirit of Stallings. The bound is a contribution to (although unfortunately not
a solution of) the strengthened Hanna Neumann conjecture.

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