Braids on surfaces and finite type invariants

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We prove that there is no functorial universal finite type invariant for braids in $Σ\times I$ if the genus of $Σ$ is positive.
6p., revised version, C.R.Acad.Sci.Paris, to appear

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Geometric Topology, Group Theory, 20F36, 57M27, 57N05, 55P62

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http://salesiana.dossiersoluciones.com/handle/123456789/68567

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0309245
 http://arxiv.org/abs/math/0309245
 C.R.Acad.Sci.Paris, 338(2004), 157-162.

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arXiv