利用Zudilin-Straub t变换探索广义Apéry极限
Exploring General Apéry Limits via the Zudilin-Straub t-transform
摘要:
受Armin Straub和Wadim Zudilin最近的一个美丽的构造的启发,“调整”了Pascal三角形的第$n$行的$s^{th}$幂的和,得到的不是数字序列,而是有理函数序列,我们对一般的二项式系数和做了同样的事情,得到了几乎无限的Apéry极限。在得到我们所说的“重大Apéry奇迹”的同时,证明了相关常数的不合理性,(即所谓的Apéry极限)是非常罕见的,我们每次都至少得到一个“小Apéry奇迹”,其中一个明确的常数,定义为(极慢收敛)极限,表示为某种递推式的Apéry极限,并给出了某些初始条件,从而能够非常快速地计算该常数,误差呈指数衰减。
英文摘要:
Inspired by a recent beautiful construction of Armin Straub and Wadim Zudilin, that 'tweaked' the sum of the $s^{th}$ powers of the $n$-th row of Pascal's triangle, getting instead of sequences of numbers, sequences of rational functions, we do the same for general binomial coefficients sums, getting a practically unlimited supply of Apéry limits. While getting what we call "major Apéry miracles", proving irrationality of the associated constants (i.e. the so-called Apéry limits) is very rare, we do get, every time, at least a "minor Apéry miracle" where an explicit constant, defined as an (extremely slowly-converging) limit of some explicit sequence, is expressed as an Apéry limit of some recurrence, with some initial conditions, thus enabling a very fast computation of that constant, with exponentially decaying error.
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