leading diagonal | principal diagonal

A diagonal of a square matrix which is traversed in the "southeast" direction. "The" diagonal (or "main diagonal, " or "principal diagonal, " or "leading diagonal") of an n×n square matrix is the diagonal from a_11 to a_(n n). The solidus symbol / used to denote division (e.g., a/b) is sometimes also known as a diagonal.

Cantor diagonal method | diagonalizable matrix | diagonal matrix | diagonal metric | diagonal Ramsey number | diagonal triangle | polygon diagonal | polyhedron diagonal | skew diagonal | solidus | subdiagonal | superdiagonal | tridiagonal matrix