Is there a way to represent something like M(x) where x is a Symbol
and M(x) is something matrix-like.
Maybe a MatrixSymbol with a second argument (i.e. M(x) is
MatrixSymbol('M', 'x'))?
Or something mimicking the Function classes in the core. But I hate
all the magic with the metaclasses. It seems excessively complicated.
I need this in order to work out some algorithms for simplification of
Dirac algebra (gamma matrices) expressions. I was thinking about using
the new rewrite rules module.
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