- essential submatrix
- мат.существенная подматрица
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Orthogonal matrix — In linear algebra, an orthogonal matrix (less commonly called orthonormal matrix[1]), is a square matrix with real entries whose columns and rows are orthogonal unit vectors (i.e., orthonormal vectors). Equivalently, a matrix Q is orthogonal if… … Wikipedia