Author Index for Volume 170 ANGELOos, JaMes R., Cowen, Cart C., anp HaukKaNEN, Pentti: Higher-Dimensional Narayan, Stvaram K.: Triangular Trunca- GCD Matrices, 53 tion and Finding the Norm of a Hadamard Hirt, Ricuarp D.: See Kunicki, Catherine M. Multiplier, 117 Bar-on, J. R. and Gray, C. W.: A Generalized Kunicki, Catnerine M. ann Hint, Ricuarp D.: Normal-Preserving Linear Transforma- Polar Decomposition, 75 tions, 107 Bru, RaFAEL, DE OLIverrA, GRACIANO, AND Vit6ria, José: REPORT: Meeting of Ma- trix Analysis and Applications, 3-5 October Linzer, Exuiot: On the Stability of Solution 1989, Universidad Politécnica de Valencia, Methods for Band Toeplitz Systems, 1 Valencia, Spain, 147 Moraes, C. H.: See Zhu, J. Cort e, Ricnarn W. ann Guu, Sy-Minc: Two Characterizations of Sufficient Matrices, 65 Cowen, Cart C.: See Angelos, James R. Narayan, SivaraM K.: See Angelos, James R. DE Ouiverra, Graciano: See Bru, Rafael Vavkin, ZDENEK: See Fiedler, Miroslav Vir6ria, José: See Bru, Rafael FIEDLER, MirosLtav AND Vavkin, ZDENEK: A Subclass of Symmetric Loewner Matrices, Watson, G. A.: Characterization of the Sub- 47 differential of Some Matrix Norms, 33 Fuyu, Jun Ici: Operator Means and Range Inclusion, 137 Zu, J. anp Morates, C. H.: On Linear Ordi- Gray, C. W.: See Bar-on, J. R. nary Differential Equations with Function- Guu, Sy-Minc: See Cottle, Richard W. ally Commutative Coefficient Matrices, 81