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Exploring General Ap\'ery Limits via the Zudilin-Straub t-transform

Number Theory 2022-05-30 v1 Numerical Analysis Numerical Analysis

Abstract

Inspired by a recent beautiful construction of Armin Straub and Wadim Zudilin, that 'tweaked' the sum of the sths^{th} powers of the nn-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 Ap\'ery limits. While getting what we call "major Ap\'ery miracles", proving irrationality of the associated constants (i.e. the so-called Ap\'ery limits) is very rare, we do get, every time, at least a "minor Ap\'ery miracle" where an explicit constant, defined as an (extremely slowly-converging) limit of some explicit sequence, is expressed as an Ap\'ery 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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Cite

@article{arxiv.2205.13601,
  title  = {Exploring General Ap\'ery Limits via the Zudilin-Straub t-transform},
  author = {Robert Dougherty-Bliss and Doron Zeilberger},
  journal= {arXiv preprint arXiv:2205.13601},
  year   = {2022}
}

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