Number of integers represented by families of binary forms (II): binomial forms

Étienne Fouvry, Michel Waldschmidt Acta Arithmetica MSC: Primary 11E76; Secondary 11D45, 11D85 DOI: 10.4064/aa230525-6-9 Opublikowany online: 8 April 2024


We consider some families of binary binomial forms $aX^d+bY^d$, with $a$ and $b$ integers. Under suitable assumptions, we prove that every rational integer $m$ with $|m|\ge 2$ is only represented by a finite number of forms of this family (with varying $d,a,b$). Furthermore, the number of such forms of degree $\ge d_0$ representing $m$ is bounded by $O(|m|^{1/d_0+\epsilon })$ uniformly for $\vert m \vert \geq 2$. We also prove that the integers in the interval $[-N,N]$ represented by one of the forms of the family of degree $d\geq d_0$ are almost all represented by some form of the family of degree $d=d_0$ if such forms of degree $d_0$ exist.

In a previous paper we investigated the particular case where the binary binomial forms are positive definite. We now treat the general case by using a lower bound for linear forms in logarithms.


  • Étienne FouvryLaboratoire de Mathématiques d’Orsay
    Université Paris-Saclay, CNRS
    91405 Orsay, France
  • Michel WaldschmidtSorbonne Université
    Institut de Mathématiques de Jussieu – Paris Rive Gauche
    75005 Paris, France

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