Matrix multiplication - Wikipedia
https://en.wikipedia.org/wiki/Matrix_multiplicationIn mathematics, particularly in linear algebra, matrix multiplication is a binary operation that produces a matrixfrom two matrices. For matrix multiplication, the number of columns in the first matrix must be equal to the number of rows in the second matrix. The resulting matrix, known as the matrix product, has the number of rows of the first and the number of columns of the second matrix. …
Matrix multiplication - Wikipedia
en.wikipedia.org › wiki › Matrix_multiplicationMatrix multiplication shares some properties with usual multiplication. However, matrix multiplication is not defined if the number of columns of the first factor differs from the number of rows of the second factor, and it is non-commutative, even when the product remains definite after changing the order of the factors.
How to Multiply Matrices
www.mathsisfun.com › algebra › matrix-multiplyingIt is a special matrix, because when we multiply by it, the original is unchanged: A × I = A. I × A = A. Order of Multiplication. In arithmetic we are used to: 3 × 5 = 5 × 3 (The Commutative Law of Multiplication) But this is not generally true for matrices (matrix multiplication is not commutative): AB ≠ BA