Re: [GiNaC-list] series of x^n around x=0

Thanks very much for the reply.! And yes, it is not well-defined in mathematical sense to taylor expand x^(3/2) around x=0. What I exactly want is to get the asyptotic behaviour of a function f(x) around x=0. For example, f(x) = x^(3/2) (1 + x + x^2 + …), the asyptotic behaviour at leading order (LO) and next-to-leading order (NLO) are x^(3/2) and x^(5/3), respectively. So I wonder there is a way to get the asyptotic behaviour of a function f(x), for example, Input: x^(3/2) * (1+x+x^2+x^3), and request the terms at LO and NLO Output: x^(3/2) + x^(5/3) Thanks again! Best regards! Feng