Let be the integral:

Int(-oo,oo)dx f(x)exp(iux) I would like to know if there is any method to

evaluate it for u-->oo

-Stationary phase method:=can't be applied since y=x has no "stationary points" for any real x.

- by the way if we had f(x)=g(x)+ih(x) could the integral above be evaluated splitting it into the real and complex part?..thanks.