counterdiagonal matrix

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Centrosymmetric matrix — In mathematics, especially in linear algebra and matrix theory, a centrosymmetric matrix is a matrix which is symmetric about its center. More precisely, an n × n matrix A = [ Ai,j ] is centrosymmetric when its entries satisfy Ai,j = An−i+1,n−j+1 … Wikipedia
Main diagonal — In linear algebra, the main diagonal (sometimes leading diagonal or major diagonal or primary diagonal or principal diagonal) of a matrix A is the collection of entries Ai,j where i is equal to j. The main diagonal of a square matrix is the… … Wikipedia
antidiagonal — noun The diagonal of a matrix that leads from top right towards bottom left Syn: counterdiagonal, secondary diagonal, minor diagonal … Wiktionary

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