I would like to write expressions involving the equivalents of MATLAB's "*"
and ".*"; i.e.
A*(B.*C)
should mean
\sum_j A_{ij} ( \sum_{pq} B_{pq} * C_{pq} )_{jk}.
I don't want to actually instantiate matrices because I don't care to
specify their shape or to index into them. Really I just need two kinds of
multiplication of non-commutative symbols. Is this possible in Sympy?
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