Proof of a generalization of the conjecture of Hanna Neumann for virtually free groups

Yu. S. Semenov

Moscow State University of Railway Communications

Abstract: The article confirms a generalization of a conjecture of Hanna Neumann for groups having the free product of three groups of order 2 as subgroups of finite index.

UDC: 512.54

MSC: 20E07

Received: 16.01.1996

DOI: 10.4213/sm169

 English version: Sbornik: Mathematics, 1996, 187:10, 1561–1575

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