Main diagonal

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In linear algebra, the main diagonal (sometimes principal diagonal, primary diagonal, leading diagonal, or major diagonal) of a matrix is the collection of entries where . All off-diagonal elements are zero. The following three matrices have their main diagonals indicated by red 1's:

The antidiagonal (sometimes counterdiagonal, secondary diagonal, trailing diagonal or minor diagonal) of a dimension square matrix, , is the collection of entries such that . That is, it runs from the top right corner to the bottom left corner:

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