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## [Axiom-developer] [#180 bug #9216 differentiating sums with respect to a

 From: kratt6 Subject: [Axiom-developer] [#180 bug #9216 differentiating sums with respect to a bound is wrong] Date: Thu, 23 Jun 2005 05:54:45 -0500

Changes
http://page.axiom-developer.org/zope/mathaction/180Bug9216DifferentiatingSumsWithRespectToABoundIsWrong/diff
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??changed:
-  The function $n\mapsto\sum_{k=1}^n f(k,n)$ is well defined only for integral
values of $n$ greater than or equal to zero. There is not even consensus how to
define this function for $n<0$. Thus, it is not differentiable. The fix I
propose is thus
The function $$n\mapsto\sum_{k=1}^n f(k,n)$$ is well defined only for
integral values of $n$ greater than or equal to zero. There is not even
consensus how to define this function for $n<0$. Thus, it is not
differentiable. The fix I propose is thus

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