Limit problem of power exponent function

Abstract：The limit problem of power exponent function is common but difficult in differential and integral calculus.Strict definition of power exponent function f (x) g (x)  is discussed, On the basis of the existence of  lim f (x)  and  lim g (x) , the limit existence of power exponent function is studied.

Keyword：power exponent function;limit;affirm form;indefinite form;