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Operations on Matrix Algebras

Centre(A) : AlgMat -> AlgMat
Given a matrix algebra A whose base ring is a field, return the centre of A.
Centralizer(A, S) : AlgMat, AlgMat -> AlgMat
Given a matrix algebra A whose base ring is a field, together with a subalgebra S of A return the centralizer of S in A.
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