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  1. Home > Articles & Issues >
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  3. A $q$-analog of Ljun ...
Conference paper

A $q$-analog of Ljunggren's binomial congruence

Armin Straub ORCID (1)
(1) Tulane University
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Imported on
January 31, 2017
Published on
December 31, 2010
Last modified on
March 31, 2025
Volume
DMTCS Proceedings vol. AO, 23rd International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2011)
Proceedings
DOI
10.46298/dmtcs.2962
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https://about.hal.science/hal-authorisation-v1
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A $q$-analog of Ljunggren's binomial congruence

Armin Straub ORCID (1)
(1) Tulane University
Abstract
English
We prove a $q$-analog of a classical binomial congruence due to Ljunggren which states that $\binom{ap}{bp} \equiv \binom{a}{b}$ modulo $p^3$ for primes $p \geq 5$. This congruence subsumes and builds on earlier congruences by Babbage, Wolstenholme and Glaisher for which we recall existing $q$-analogs. Our congruence generalizes an earlier result of Clark.
French
Nous démontrons un $q$-analogue d'une congruence binomiale classique de Ljunggren qui stipule: $\binom{ap}{bp} \equiv \binom{a}{b}$ modulo $p^3$ pour $p$ premier tel que $p \geq 5$. Cette congruence s'inspire d'une précédente congruence prouvée par Babbage, Wolstenholme et Glaisher pour laquelle nous présentons les $q$-analogues existantes. Notre congruence généralise un précédent résultat de Clark.
Keywords
  • [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO]
  • [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
  • $q$-analogs
  • binomial coefficients
  • binomial congruence
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