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"
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References in periodicals archive ?
Rather, the principal narrative is indicated by the leading diagonal that starts at the bottom-left of the sketch with the "state of the art" box, and then steps up through the capability blocks to the vision at top right.
STEP 3: The leading diagonal elements (only three elements in this case) of the window size 3x3 is selected and sorted.