English

Log-behavior of the root sequences of P-recursive sequences

Combinatorics 2023-10-31 v1

Abstract

In recent years, Sun has proposed numerous conjectures regarding the log-concavity of root sequences \{\sqrt[n]{a_n}}_{n\geqslant 1}. We establish criteria for the asymptotic log-concavity of \{\sqrt[n]{a_n}}_{n\geqslant 1} and the asymptotic ratio log-convexity of \{\sqrt[n]{a_n}}_{n\geqslant 1} for PP-recursive sequences \{\sqrt[n]{a_n}}_{n\geqslant{0}}. Additionally, by the aid of symbolic computation, we present a systematic approach to determine the explicit integer NN such that the sequence \{\sqrt[n]{a_n}}_{n\geqslant{N}} is log-concave and the sequence \{\sqrt[n]{a_n}}_{n\geqslant N} is ratio log-convex.

Keywords

Cite

@article{arxiv.2310.19234,
  title  = {Log-behavior of the root sequences of P-recursive sequences},
  author = {Qing-hu Hou and Zhongjie Li},
  journal= {arXiv preprint arXiv:2310.19234},
  year   = {2023}
}

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15 pages