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Composition of series
I am trying to compose two series with Mathematica : One is f1(x) = ... The other is x(y) = ... ComposeSeries quits complaining that the expansion point of the first series is different from the constant term of the second series (ComposeSeries::scmp). What I am really trying to do here is to express f (x) as a series in Log[x] (x is strictly greater than zero), so the second series is simply the series expansion of Exp[y]. Mathematically, what is the problem with even attempting this operation ? Can't I replace x by log(z) in the first series, no matter what ?