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arXiv 1804.03549math.GT
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闭辫子的单上循环不变量

One-cocycle invariants for closed braids

Thomas Fiedler

摘要:

我们引入了新的多项式同痕不变量。它们被构造为多项式值{ \em高斯图1-cocycles}上的完整旋转的封闭编织$\hat β$周围的核心相应的固体环面评估。它们可以相对于编织物长度用多项式复杂度计算,并且在$x=1$上评估的它们的导数是闭合编织物的有限型不变量。设实环面V是标准嵌入在3-球面中,设L是互补实环面$S^3\setminus V$的核。我们给出的例子表明,我们的不变量的自然细化可以检测(即使是线性复杂性相对于辫子长度,如果股的数量是固定的,并与二次复杂性,如果它不是固定的)的不可逆性的2-分量链接$\hat β\cup L\hookrightarrow S^3$,量子不变量不能做什么。

英文摘要:

We introduce new polynomial isotopy invariants for closed braids. They are constructed as polynomial valued {\em Gauss diagram 1-cocycles} evaluated on the full rotation of the closed braid $\hat β$ around the core of the corresponding solid torus. They can be calculated with polynomial complexity with respect to the braid length and their derivatives evaluated at $x=1$ are finite type invariants of closed braids. Let the solid torus V be standardly embedded in the 3-sphere and let L be the core of the complementary solid torus $S^3\setminus V$. We give examples which show that a natural refinement of our invariants can detect (even with linear complexity with respect to the braid length if the number of strands is fixed, and with quadratic complexity if it is not fixed) the non-invertibility of the 2-component link $\hat β\cup L\hookrightarrow S^3$, what quantum invariants fail to do.

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