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On the combination theorem for negatively curved groups. (English) Zbl 0879.20014
Int. J. Algebra Comput. 6, No. 6, 751-760 (1996); reprinted with corrected references in ibid. 7, No. 2, 267-276 (1997).
Author’s abstract: We give a simple proof of a sufficient condition for an amalgamated free product of two negatively curved groups to be negatively curved, and we compute the curvature of such products.

MSC:
20F65 Geometric group theory
20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
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