Hi, I was wondering if its possible to take derivatives with respect to
indexed symbols. For example,
>>> from sympy.tensor import IndexedBase, Idx>>> x = IndexBase('x')>>> i, j =
>>> map(Idx, ['i', 'j'])>>> x[i].diff(x[j])ValueError: Can't differentiate wrt
>>> the variable: x[j], 1
I'd like Sympy to return KroneckerDelta(i,j).
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