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arXiv 2103.11347math.NTmath.AGmath.DS
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椭圆台球的精确性定理和动力学Mordell-Lang猜想的一个变体

Finiteness theorems on elliptical billiards and a variant of the Dynamical Mordell-Lang Conjecture

Pietro Corvaja, Umberto Zannier

摘要:

我们提供了一些定理,主要是有限性,某些模式在椭圆台球,有关的周期性轨迹。例如,如果两个运动员在给定位置击球,并且方向在$(0,π)$中形成固定角度,则两个轨迹都是周期性的情况只有20%。另一个例子是台球杆的有限性,它把一个给定的球送入另一个球,使这个球最终落入一个洞。这些结果起源于马宁-芒福德猜想的“相对”情况,并构成算术内容如何影响混沌行为(台球)的实例。我们还将通过一个动态莫德尔-朗猜想的变体来解释这些陈述。反过来,这包括的情况下,有些令人惊讶的是,可以处理(只有)完全不同的方法相比,前者;在这里,我们将提供一个明确的例子有关的丢番图方程在代数环面。

英文摘要:

We offer some theorems, mainly of finiteness, for certain patterns in elliptical billiards, related to periodic trajectories. For instance, if two players hit a ball at a given position and with directions forming a fixed angle in $(0,π)$, there are only finitely many cases for both trajectories being periodic. Another instance is the finiteness of the billiard shots which send a given ball into another one so that this falls eventually in a hole. These results have their origin in `relative' cases of the Manin-Mumford conjecture, and constitute instances of how arithmetical content may affect chaotic behaviour (in billiards). We shall also interpret the statements through a variant of the dynamical Mordell-Lang conjecture. In turn, this embraces cases which, somewhat surprisingly, can be treated (only) by completely different methods compared to the former; here we shall offer an explicit example related to diophantine equations in algebraic tori.

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