Subtle point in definition of BNS invariant – mathoverflow.net

Subtle point in definition of BNS invariant – mathoverflow.net

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Let $G$ be a finitely generated group. Let $S(G)$ be the quotient of $\text{Hom}(G,\mathbb{R}) \setminus \{0\}$ by the equivalence relation that identifies two homomorphisms if they differ by scaling ...

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