设m是正偶数,又设a=︱m(m4-10 m2+5)︱,b=5m4-10 m2+1,c=m2+1.证明了当m是2的方幂时,方程x^2+b^y=c^z仅有正整数解(x,y,z)=(a,2,5)适合2︱y.
Let m be a positive even integer, and let a = |m(m^4- 10m^2 +5) | ,b = 5m^4 - 10m^2 +1, c=m^2 + 1. In this paper we prove that if m is a power of 2,then equation x^2 +b^y=c^z has only the positive integer solution (x,y,z) = (a,2,5) with 2 |y