Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3304 by [email protected]: remove direct calls to Subs in
Derivative and move the logic to the .subs method
http://code.google.com/p/sympy/issues/detail?id=3304
`Derivative` is ridden with repetition of code related to the use of
`Subs`. All this can and should be done by a sufficiently smart `.subs`
method.
I am leaving it as a Defect and not an Enhancement, because it causes ugly
indexing of dummy variables.
The easiest way to fix it is to start with the `Dummy('xi'...)` variables
and move them to the `.subs` method and fix the rest from there.
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