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Almost positive links are strongly quasipositive. (arXiv:1809.06692v1 [math.GT])

来源于:arXiv
We prove that a link is strongly quasipositive if it admits a diagram with a single negative crossing. This answers a question of Stoimenow's in the (strong) positive. As a second main result, we give simple and complete characterizations of link diagrams with quasipositive Seifert surfaces produced by Seifert's algorithm. 查看全文>>