Mathematical Systems Theory, Volume 22

Volume 22, Number 1, 1989

IJsbrand Jan Aalbersberg, Hendrik Jan Hoogeboom: Characterizations of the Decidability of Some Problems for Regular Trace Languages. 1-19
Steven Homer, Jie Wang: Absolute Results Concerning One-Way Functions and Their Applications. 21-35
Andrew Klapper: Generalized Lowness and Highness and Probabilistic Complexity Classes. 37-45
Satoru Miyano: The Lexicographically First Maximum Subgraph Problems: P-Completeness and NC Algorithms. 47-73

Dirk Janssens, Grzegorz Rozenberg: Actor Grammars. 75-107
Madanpal S. Verma, James C. Romig: Reduced-Order Controllers in H^\infty-Optimal Synthesis Methods of the First Kind. 109-148

Tero Harju, H. C. M. Kleijn: Cardinality Problems of Composition of Morphisms and Inverse Morphisms. 151-159
Volker Diekert, Walter Vogler: On the Synchronization of Traces. 161-175
Hangju Cho, Steven I. Marcus: Supremal and Maximal Sublanguages Arising in Supervisor Synthesis Problems with Partial Observations. 177-211
Wijesuriya Dayawansa, David Elliott, Clyde Martin: Feedback Transformations on Tori. 213-219

Stephen J. Hegner: Algebraic Representation of Dynamics and Behavior for Continuous-Time Linear Systems. 227-254
Darrell Williamson, Robert E. Skelton: Optimal q-Markov COVER for Finite Wordlength Implementation. 255-273
Liyi Dai: Strong Decoupling in Singular Systems. 275-289
F. Celle, J. P. Gauthier, D. Kazakos, G. Sallet: Synthesis of Nonlinear Observers: A Harmonic-Analysis Approach. 291-322
E. M. Hemerly, M. H. A. Davis: Recursive Order Estimation of Stochastic Control Systems. 323-346