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 ?
In other words, f reflects the entries of elements of g across the antidiagonal, up to a constant multiple.
1[less than or equal to]i,j[less than or equal to]n] by reflection across the main antidiagonal {[x.
Let [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] be the [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] counteridentity matrix defined as having ones on the antidiagonal and zeros elsewhere.