A geometric invariant of discrete groups.
W.D. Neumann, R. Bieri, R. Strebel (1987)
Inventiones mathematicae
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W.D. Neumann, R. Bieri, R. Strebel (1987)
Inventiones mathematicae
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Takayuki Morifuji (2009)
Banach Center Publications
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We discuss relations among several invariants of 3-manifolds including Meyer's function, the η-invariant, the von Neumann ρ-invariant and the Casson invariant from the viewpoint of the mapping class group of a surface.
M.A. Ronan, J. Tits (1994)
Inventiones mathematicae
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S.M. Gersten, H.B. Short (1990)
Inventiones mathematicae
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Kenneth Keller Hickin (1981)
Colloquium Mathematicae
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Mladen Bestvina, Mark Feighn (1995)
Inventiones mathematicae
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William L. Paschke (1993)
Mathematica Scandinavica
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Gilbert Levitt (1994)
Publicacions Matemàtiques
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Let G be a finitely generated group. We give a new characterization of its Bieri-Neumann-Strebel invariant Σ(G), in terms of geometric abelian actions on R-trees. We provide a proof of Brown's characterization of Σ(G) by exceptional abelian actions of G, using geometric methods.
F. Clauwens (1975)
Inventiones mathematicae
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W.D. Evans, D.J. Harris (1993)
Mathematische Annalen
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Mladen Bestvina, Mark Feighn (1991)
Inventiones mathematicae
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L. Auslander, J. Brezin (1973)
Inventiones mathematicae
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