In mathematics, matrix multiplication is a binary operation that produces a matrix from two matrices. Multiplying an m×k matrix by a k×n matrix produces a new m×n matrix — the number of columns in the first matrix must equal the number of rows in the second, and that shared value (k) doesn't appear in the result's own dimensions at all.
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A is m×k, B is k×n — k (A's columns, B's rows) has to match.
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