On Saturday, April 15, 2017 at 6:54:44 AM UTC-4, oldk1331 wrote: > > > Well, this patch only works for '*', I want it more generalized, > at least for 's_test/x' . > As much as I like formal symbol flipping without concern for the application there are problems with this. In general this turns a Taylor Series into a Laurent series if [t^0]s_test != 0. This conversion is not valid for a lot of Method of Coefficients and combinatorial arguments. It's part of a set assumptions that are carried forward in some arguments. For instance: the result of x*s_test/x would depend upon the order of operations, and Lagrange Inversion has conditions on f(x) before it is valid.
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