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arXiv 2203.09013math.DS
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钉扎台球碰撞次数的上界

Upper bound on the number of collisions of pinned billiard balls

Krzysztof Burdzy, Mauricio Duarte

摘要:

我们考虑“钉球”系统,即,具有固定位置和伪速度的球。伪速度的变化规律与运动球之间的全弹性碰撞速度的变化规律相同。对于不同的钉扎球对的可能的伪碰撞的时间选择在一个外生的方式。本文给出了$d$维空间中$n$钉扎球系统的最大伪碰撞次数的一个明确的上界。证明是基于对折叠的分析,即,将沿着折痕折叠一张纸的想法形式化的映射。本文证明了一个点的轨道的大小的上界。

英文摘要:

We consider systems of "pinned balls," i.e., balls that have fixed positions and pseudo-velocities. Pseudo-velocities change according to the same rules as those for velocities of totally elastic collisions between moving balls. The times of possible pseudo-collisions for different pairs of pinned balls are chosen in an exogenous way. We give an explicit upper bound for the maximum number of pseudo-collisions for a system of $n$ pinned balls in a $d$-dimensional space. The proof is based on analysis of foldings, i.e., mappings that formalize the idea of folding a piece of paper along a crease. We prove an upper bound for the size of an orbit of a point subjected to foldings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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