|On usual, virtual and welded knotted objects up to homotopy |
Auteur(s): Audoux B., BELLINGERI Paolo, Meilhan Jean-Baptiste, Wagner Emmanuel
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We consider several classes of knotted objects, namely usual, virtual and welded pure braids and string links, and two equivalence relations on those objects, induced by either self-crossing changes or self-virtualizations. We provide a number of results which point out the differences between these various notions. The proofs are mainly based on the techniques of Gauss diagram formulae.