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arXiv 0905.4186math.GTmath.AG
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低次实代数纽结

Real algebraic knots of low degree

Johan Björklund

摘要:

本文研究了$\R P^3$中的有理实代数纽结。证明了两个实代数纽结$\leq5$是刚性同位的当且仅当它们的次数和复圈相等。我们还表明,任何不可约光滑结,承认一个平面投影小于或等于四个交叉有一个合理的参数化程度$\leq 6$。此外,一个显式的建设合理的纽结的一个给定的程度与任意encomplexed扭(受自然的限制)。

英文摘要:

In this paper we study rational real algebraic knots in $\R P^3$. We show that two real algebraic knots of degree $\leq5$ are rigidly isotopic if and only if their degrees and encomplexed writhes are equal. We also show that any irreducible smooth knot which admits a plane projection with less than or equal to four crossings has a rational parametrization of degree $\leq 6$. Furthermore an explicit construction of rational knots of a given degree with arbitrary encomplexed writhe (subject to natural restrictions) is presented.

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