The output of * operator in this solution is a struct, rather than a mPoly object. Nevertheless, the test suite does not check the type of the output.
L Y Cao, since you're such a wizard with indices, I'd love to see you solve this without converting to the array form. It would be interesting to compare the approaches.
Andrew Newell, thanks for your advice.
Find common elements in matrix rows
Check if number exists in vector
Magic is simple (for beginners)
Multivariate polynomials - emulate symbolic form
Negation the hard way
Outer product of multiple vectors
Multivariate polynomials - sort monomials
Multivariate polynomials - convert monomial form to array
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