Line 4076: -- 1-by-1 and 2-by-2 blocks. 2-by-2 blocks will be standardized in the
4072: -- eigenvalues, the real Schur form T, and, optionally, the matrix of
4073: -- Schur vectors Z. This gives the Schur factorization A = Z*T*(Z**T).
4074: --
4075: -- A matrix is in real Schur form if it is upper quasi-triangular with 4076: -- 1-by-1 and 2-by-2 blocks. 2-by-2 blocks will be standardized in the 4077: -- form
4078: -- [ a b ]
4079: -- [ c a ]
4080: --