Cross multiplication --- Introduction ---

We know that the multiplication of matrices is not commutative, that is, if A and B are two square matrices of the same size, the matrix C=AB−BA is not zero in general.
This exercise Cross multiplication therefore presents you two matrices A and C, of size .And your goal will be to find a matrix B such that AB−BA=C (or BA−AB=C, according to the circonstances).
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