The primary application of expand is to distribute products over sums. This is done for all polynomials. For quotients of polynomials, only sums in the numerator are expanded; products and powers are left alone.
The expand(M) function computes the element-wise expansion of M. The result, R, is formed as R[i,j] = expand(M[i,j]).
M ≔ Matrix⁡2,3,'fill'=a⁢x+y:
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