What do you mean by diagonal and principal diagonal in matrix?
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Definition of principal diagonal. : thediagonal in a square matrix that runs from upper left to lower right.The main diagonal of a matrix consists of those elements that lie on the diagonal that runs from top left to bottom right. If the matrix is A, then its main diagonal are the elements who's row number and column number are equal, ajj. The other diagonal of a matrix is not important and does not have a name.
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