2 papers
math.RA1998
Principal pivot transforms: properties and applications
Michael Tsatsomeros
The principal pivot transform (PPT) of a matrix A partitioned relative to an invertible leading principal submatrix is a matrix B such that A [x_1^T x_2^T]^T = [y_1^T y_2^T]^T if a…
math.RA1998
Inverse tridiagonal Z-matrices
J. J. McDonald, R. Nabben, M. Neumann +2
In this paper, we consider matrices whose inverses are tridiagonal Z--matrices. Based on a characterization of symmetric tridiagonal matrices by Gantmacher and Krein, we show that…