On Dehn functions of free products of groups

On Dehn functions of free products of groups
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by V. S. Guba and M. V. Sapir PDF

Proc. Amer. Math. Soc. 127 (1999), 1885-1891 Request permission

In this article we show that the Dehn function of a nontrivial free product of groups is equivalent to its subnegative closure.

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