Table of Contents Linear Algebra and its Applications VOLUMES 205-206, JULY 1-JULY 15, 1994 Third Special Issue on Linear Systems and Control, Part II Special Issue Editors: A. C. Antoulas, M. L. J. Hautus, P. A. Fuhrmann, and Y. Yamamoto ==================================== Contents Volumes 205-206 Shinji Hara, Hisaya Fujioka (Yokohama, Japan), and Pierre T. Kabamba (Ann Arbor, Michigan) A Hybrid State-Space Approach to Sampled-Data Feedback Control 675 M. L. J. Hautus (Eindhoven, the Netherlands) Operator Substitution 713 J. Hoffmann (Kaiserslautern, Germany) and P. A. Fuhrmann (Beer-Sheva, Israel) Remarks on Orthogonal Polynomials and Balanced Realizations 741 J. Hoffmann and D. Pratzel-Wolters (Kaiserslautern, Germany) Dipolynomial Minimal Bases and Linear Systems in AR Representation 777 E. W. Kamen (Atlanta, Georgia) Block-Form Control of Linear Time-Invariant Discrete-Time Systems Defined over Commutative Rings 805 Nicos Karcanias (London, United Kingdom) Minimal Bases of Matrix Pencils: Algebraic Toeplitz Structure and Geometric Properties 831 Tohru Katayama (Kyoto, Japan) A Spectral Factorization Algorithm for Discrete-Time Descriptor Systems via Generalized Eigenproblems 869 A. P. Kishore and J. B. Pearson, Jr. (Houston, Texas) Kernel Representation and Properties of Discrete-Time Input-Output Systems 893 Renee Koplon, Eduardo D. Sontag (New Brunswick, New Jersey), and M. L. J. Hautus (Eindhoven, the Netherlands) Observability of Linear Systems With Saturated Outputs 909 Hans-Andrea Loeliger (Linkoping, Sweden), G. David Forney, Jr. (Mansfield, Massachusetts), Thomas Mittelholzer (Zurich, Switzerland), and Mitchell D. Trott (Cambridge, Massachusetts) Minimality and Observability of Group Systems 937 Denis Mustafa (Oxford, United Kingdom) How Much Integral Action Can a Control System Tolerate? 965 M. A. Peters and A. A. Stoorvogel (Eindhoven, the Netherlands) Mixed H2/H Control in a Stochastic Framework 971 Giorgio Picci and Stefano Pinzoni (Padova, Italy) Acausal Models and Balanced Realizations of Stationary Processes 997 Allen C. Raines III and David S. Watkins (Pullman, Washington) A Class of Hamiltonian-Symplectic Methods for Solving the Algebraic Riccati Equation 1045 Cheryl B. Schrader (San Antonio, Texas) Dynamical Structures on Pencils, Poles, and Fundamental Subspaces 1061 J. A. Sefton and R. J. Ober (Richardson, Texas) Hankel-Norm Approximation and Control Systems 1081 J. de Does and J. M. Schumacher (Amsterdam, the Netherlands) Continuity of Singular Perturbations in the Graph Topology 1121 Alle-Jan van der Veen and Patrick Dewilde (Delft, the Netherlands) On Low-Complexity Approximation of Matrices 1145 Xiaochang Wang (Lubbock, Texas) and Joachim Rosenthal (Notre Dame, Indiana) A Cell Structure for the Set of Autoregressive Systems 1203 Siep Weiland (Eindhoven, the Netherlands) A Behavioral Approach to Balanced Representations of Dynamical Systems 1227 Harald K. Wimmer (Wurzburg, Germany) A Galois Correspondence Between Sets of Semidefinite Solutions of Continuous-Time Algebraic Riccati Equations 1253 Q.-H. Wu and M. Mansour (Zurich, Switzerland) On the Stability Hyperellipsoid of a Schur Polynomial 1271 Xin Xin and Hidenori Kimura (Osaka, Japan) (J, J')-Lossless Factorization for Descriptor Systems 1289 Yutaka Yamamoto and Mituhiko Araki (Kyoto, Japan) Frequency Responses for Sampled-Data Systems - Their Equivalence and Relationships 1319 Author Index 1341