In linear algebra, two matrices
are called the commutant of matrix
[1] A set of matrices
is said to commute if they commute pairwise, meaning that every pair of matrices in the set commutes.
The notion of commuting matrices was introduced by Cayley in his memoir on the theory of matrices, which also provided the first axiomatization of matrices.
The first significant results on commuting matrices were proved by Frobenius in 1878.