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arxiv: 1611.07936 · v2 · pith:BG55P26Onew · submitted 2016-11-23 · 🧮 math.GT · math.GR

Spectral gap of scl in free products

classification 🧮 math.GT math.GR
keywords lambdafreeconjugateduncan-howieelementgeneralizesgivesgroups
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Let $G=*_\lambda G_\lambda$ be a free product of torsion-free groups, and let $g\in[G,G]$ be any element not conjugate into a $G_\lambda$. Then scl$_G(g)\ge1/2$. This generalizes, and gives a new proof of a theorem of Duncan-Howie.

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