main diagonal

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Noun1.main diagonal - the diagonal of a square matrix running from the upper left entry to the lower right entry
diagonal - an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
References in periodicals archive ?
STEP 3: The leading diagonal elements (only three elements in this case) of the window size 3x3 is selected and sorted.
4550 could be a leading diagonal as wave i and the rally to 1.
In the above count, I am treating wave 1 as a leading diagonal.