Keyword : Quasi-triangular

F08QHF	Solve real Sylvester matrix equation $A X + X B = C$ , $A$ and $B$ are upper quasi-triangular or transposes
F08QKF	Left and right eigenvectors of real upper quasi-triangular matrix
F08QLF	Estimates of sensitivities of selected eigenvalues and eigenvectors of real upper quasi-triangular matrix
F08YKF	Left and right eigenvectors of a pair of real upper quasi-triangular matrices