Abstract

An effectively verifiable condition for quasipositivity of links is given. In particular, it is proven that if a quasipositive link can be represented by an alternating diagram satisfying the condition that no pair of Seifert circles is connected by a single crossing, then the diagram is positive and the link is strongly quasipositive.

中文翻译：

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关于交替的准正链接

摘要

给出了链准正性的有效可验证条件。尤其是，已经证明，如果可以用满足以下条件的交替图来表示准正路段：通过一个交叉点不连接塞弗特圆对，则该图为正，并且该路段为强准正路。