The matrix ring of degree n is the set of all n-by-n square matrices together with the usual vector space and matrix multiplication operations.
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A matrix ring is a specific type of ring constructed from matrices over a ring. Formally, if \( R \) is a ring (which can be, for example, a field or another ring), then the set of \( n \times n \) matrices with entries from \( R \) forms a ring, denoted by \( M_n(R) \). The operations defined in this ring are matrix addition and matrix multiplication.