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- You might be looking for Thue–Siegel–Roth theorem.
Thue's theorem is a mathematical theorem first proved by Axel Thue in 1909.A. Thue, Über Annäherungswerte algebraischer Zahlen, Journal für die reine und angewandte Mathematik, 135, pages 284-305 (1909)
Statement of Thue's theorem
If f is a bivariate form with rational coefficients which is irreducible over the rational numbers and has degree greater than or equal to 3, and r is a rational number other than 0, then the equation
- f(x,y)=r
An equation of the form f(x,y)=r, where f and r are as in the theorem, is called a Thue equation. Hence the theorem can be stated concisely as: Any Thue equation has only finitely many integer solutions.
References
"Thue's theorem"