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If ๐ด is a square matrix, and if a matrix ๐ต of the same size can be found such that ๐ด๐ต = ๐ต๐ด = ๐ผ, then ๐ด is said to be invertible (or nonsingular) and ๐ต is called an inverse of ๐ด. If no such matrix ๐ต can be found, then ๐ด is said to be singular.Remark 1: The relationship ๐ด๐ต = ๐ต๐ด = ๐ผ is not changed by interchanging ๐ด and ๐ต, so if ๐ด is invertible and ๐ต is an inverse of ๐ด, then it is also true that ๐ต is invertible, and ๐ด is an inverse of B


Original text

If ๐ด is a square matrix, and if a matrix ๐ต of the same size can be found such that ๐ด๐ต = ๐ต๐ด = ๐ผ, then ๐ด is said to be invertible (or nonsingular) and ๐ต is called an inverse of ๐ด. If no such matrix ๐ต can be found, then ๐ด is said to be singular.Remark 1: The relationship ๐ด๐ต = ๐ต๐ด = ๐ผ is not changed by interchanging ๐ด and ๐ต, so if ๐ด is invertible and ๐ต is an inverse of ๐ด, then it is also true that ๐ต is invertible, and ๐ด is an inverse of B


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