Surveys in Mathematics and its Applications (Apr 2019)
A Survey on the ternary purely exponential diophantine equation ax + by = cz
Abstract
Let a, b, c be fixed coprime positive integers with min(a,b,c)>1. In this survey, we consider some unsolved problems and related works concerning the positive integer solutions (x,y,z) of the ternary purely exponential diophantine equation ax + by = cz.