论文标题
打孔球上的结图作为字符串图的模型
Knot diagrams on a punctured sphere as a model of string figures
论文作者
论文摘要
在拓扑上,弦琴形象是一个琐碎的结,位于虚构平面上的手指正交上,有一些交叉点。手指阻止取消这些十字路口。作为字符串图的数学模型,我们考虑了$ xyz $ -space的$ xy $ - 平面上的结图,缺少与$ z $轴平行的一些直线。这些直线对应于手指。我们研究了这些结中的这些结图的交叉数量最少,但缺少这些线路。
A string figure is topologically a trivial knot lying on an imaginary plane orthogonal to the fingers with some crossings. The fingers prevent cancellation of these crossings. As a mathematical model of string figure we consider a knot diagram on the $xy$-plane in $xyz$-space missing some straight lines parallel to the $z$-axis. These straight lines correspond to fingers. We study minimal number of crossings of these knot diagrams under Reidemeister moves missing these lines.