I don't know of an easy way to do this. Even if you extended diff to
do something like diff(A(i)*k(t,i), k(t,j)) --> A(i) * kron_delta(i,j),
you would still have the task of getting Maxima to simplify sums that
involve the Kronecker delta.
--Barton
maxima-bounces at math.utexas.edu wrote on 11/23/2010 05:05:43 AM:
> [image removed]
>
> [Maxima] diff into 'sum
>
> Juan Pablo Carbajal
>
> to:
>
> maxima mailing list
>
> 11/23/2010 05:05 AM
>
> Sent by:
>
> maxima-bounces at math.utexas.edu
>
> Hi all,
>
> Continuing with my work on kinematic chains (yes, I know I should be
> using tensors, but it isn't that user-friendly). Is there anyway to
> simplify
>
> diff('sum(A(i)*k(t,i),i,1,3),k(t,j));
>
> to
>
> A(j)
>
> I know is really abstract, but maybe someone has already been here?
>
> Thanks
>
> --
> M. Sc. Juan Pablo Carbajal
> -----
> PhD Student
> University of Z?rich
> www.ailab.ch/carbajal
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