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arXiv 0910.0904math.NTmath.CO
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代数曲线上的同时等差数列

Simultaneous Arithmetic Progressions on Algebraic Curves

Ryan Schwartz, József Solymosi, Frank de Zeeuw

摘要:

一个同时的等差数列(s. a. p.)由k个点(x_i,y_σ(i))组成,其中x_i,y_i是等差数列,σ是置换。Garcia-Selfa和Tornero问是否有一个长度上的s. a. p.的椭圆曲线在维尔斯特拉斯形式超过Q。我们证明了4319是R上曲线的这样一个界。这是通过将网格中曲线的平移视为图形来完成的。一个简单的上界的交叉数和“交叉不等式”给出了一个下界。这些因素共同决定了曲线上s. a. p.的长度。然后,我们使用类似的方法将结果推广到任意实代数曲线。而不是考虑s. a. p.我们考虑网格中的k^2/3点。交叉点的数目由Bezout定理限定。然后,我们给出了另一个证明使用的结果Jarnik界定的数量网格点的凸曲线。这个结果适用于任何实代数曲线可以分为凸和凹的部分,其数量取决于程度。最后,将这些结果推广到复代数曲线。

英文摘要:

A simultaneous arithmetic progression (s.a.p.) of length k consists of k points (x_i, y_σ(i)), where x_i and y_i are arithmetic progressions and σis a permutation. Garcia-Selfa and Tornero asked whether there is a bound on the length of an s.a.p. on an elliptic curve in Weierstrass form over Q. We show that 4319 is such a bound for curves over R. This is done by considering translates of the curve in a grid as a graph. A simple upper bound is found for the number of crossings and the 'crossing inequality' gives a lower bound. Together these bound the length of an s.a.p. on the curve. We then use a similar method to extend the result to arbitrary real algebraic curves. Instead of considering s.a.p.'s we consider k^2/3 points in a grid. The number of crossings is bounded by Bezout's Theorem. We then give another proof using a result of Jarnik bounding the number of grid points on a convex curve. This result applies as any real algebraic curve can be broken up into convex and concave parts, the number of which depend on the degree. Lastly, these results are extended to complex algebraic curves.

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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