摘要
Ljunggren proved that the equations x^3+1=Dy^2, D】2, d|D, 3D, d is not a square (1) and x^3-1=Dy^2, d is not prime of the form 6l+1 (1)′have one positive integral solution at most. Ko Chao and Sun Chi proved that eqs.(1) and(1)′both have no nontrivial integral solution. In this letter, we prove the following theorems.
