let e_1,...,e_n bet a set of noncommutative symbols. Consider the
sympy expressions -
a = a_0+a_1*e_1+...+a_n*e_n
b = b_0+b_1*e_1+...+b_n*e_n
and you are given a multiplication table for the e_i's in the form of a
dictionary mul_table[(e_i,e_j)].
Each entry in the table is a linear combination of a scalar and the e_i's.
What is the most efficient way of performing the operation a*b where the
table results for e_i*e_j are
substituted (a*b is again a linear combination of a scalar and the e_i's).
For example is there a way of overloading the __mul__ operation for
expressions to test and substitute
for products of the form e_i*e_j?
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