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Differentiation of a power series.

asked 2011-09-20 09:07:06 +0200

updated 2011-09-21 01:49:11 +0200

I wonder whether it is too hard to implement the derivative function for multivariate Power Series Ring. Since it is already implemented for one variable, is it not possible to implement it for multivariable, by treating the ring in one var over the ring in other vars.


QQ[[x,y,z]] = QQ[[x,y]][z]]

Thanks and regards


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answered 2011-12-31 08:17:38 +0200

Volker Braun gravatar image

This is now ticket #12241

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Hi Volker, Thanks for the patch. I tried to apply the patch using hg_sage.apply('filename'). It did not give me any error (however gave an irrelevant warning about .sagerc file). But the code sage: T.<a,b> = PowerSeriesRing(ZZ,2) sage: f = a + b + a^2*b sage: f = a + b + a^2*b + T.O(4) sage: f.derivative(a) Gives NotImplementedError Traceback (most recent call last) Do I have to install something more to make this patch work? -- VInay

VInay Wagh gravatar imageVInay Wagh ( 2012-01-01 05:32:06 +0200 )edit

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Asked: 2011-09-20 09:07:06 +0200

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Last updated: Dec 31 '11