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05/25/10 12:23pm


Does anyone know how to tell Mathematica to give the terms in a Series expansion by the order they appear and not by the specified power?

For example, the thirs term in the series

Series[(1 + x^2)^z, {x, 0, 4}]

is: 1/2 (-z + z^2) x^4

which is a fourth order power but it's the third non-zero term in the series. Can I ask Mathematica for the "third non-zero" term and have this in return? Can I ask for the n-th non zero term in a series in general?

Thanks a lot!

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