!! used as default html header if there is none in the selected theme. Cross multiplication

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=A B-B A 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 A B-B A=C (or B A-A B=C, according to the circonstances).
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