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JOURNALS // Chebyshevskii Sbornik // Archive

Chebyshevskii Sb., 2023 Volume 24, Issue 5, Pages 237–243 (Mi cheb1387)

BRIEF MESSAGES

Transcendence of certain $2$-adic numbers

V. G. Chirskiiab

a Russian Presidential Academy of National Economy and Public Administration (Moscow)
b Lomonosov Moscow State University (Moscow)

Abstract: We prove here that at least one of the two 2-adic numbers which are the values at $z=1$ of the sums in $ \mathbb{\mathrm{Q}}_2 $ of the series
$$ f_{0}(\lambda)=\sum_{n=0}^\infty (\lambda)_{n}\lambda^{n}, f_{1}(\lambda)=\sum_{n=0}^\infty (\lambda +1)_{n}\lambda^{n},$$
where $ \lambda $ is a certain polyadic Liouville number. The series considered converge in any field $ \mathbb{\mathrm{Q}}_p $ .We deal here with $ \mathbb{\mathrm{Q}}_2 $. The symbol $(\gamma)_{n}$ denotes Pochhammer symbol, i.e. $(\gamma)_{0}=1$ , and for $n\geq 1$ we have$ (\gamma)_{n}=\gamma(\gamma+1)...(\gamma+n-1)$. The values of these series were also calculated at polyadic Liouville number. The canonic expansion of a polyadic number $\lambda$ is of the form
$$ \lambda= \sum_{n=0}^\infty a_{n} n!, a_{n}\in\mathbb{\mathrm{Z}}, 0\leq a_{n}\leq n.$$
This series converges in any field of $p-$ adic numbers $ \mathbb{\mathrm{Q}}_p $ . We call a polyadic number $\lambda$ a polyadic Liouville number, if for any $n$ and $P$ there exists a positive integer $A$ such that for all primes $p$ ,satisfying $p\leq P$ the inequality
$$\left|\lambda -A \right|_{p}<|A|^{-n}$$
holds. It was proved earlier that the Liouville polyadic number is transcendental in any field $\mathbb{\mathrm{Q}}_p.$ In other words,the Liouville polyadic number is globally transcendental. It allowed to prove using some equality that there exists an infinite set of $p-$adic fields $ \mathbb{\mathrm{Q}}_p $ where at least one of the numbers $f_{0}(z),f_{1}(z).$ Here we prove the transcendence of values in the field $ \mathbb{\mathrm{Q}}_2 $.

Keywords: transcendence, polyadic number, polyadic Liouville number,.

UDC: 511.36

Received: 15.10.2023
Accepted: 21.12.2023

DOI: 10.22405/2226-8383-2023-24-5-237-243



© Steklov Math. Inst. of RAS, 2025