SIAM Journal on Control and Optimization
Volume 32, Number 4, July 1994
Contents

An Adaptive Servomechanism for a Class of Infinite-Dimensional
Systems
Hartmut Logemann and Achim Ilchmann

Minimax-Optimal Strategies for the Best-Choice Problem When a Bound
is Known for the Expected Number of Objects
T. P. Hill and D. P. Kennedy

The H-infinity-Problem with Control Constraints
Viorel Barbu

Positive Dependence of a Class of Multivariate Exponential
Distributions
Ingram Olkin and Y. L. Tong

Observability and Observers for Nonlinear Systems
J. P. Gauthier and I. A. K. Kupka

Decomposition and Parametrization of Semidefinite Solutions of the
Continuous-Time Algebraic Riccati Equation
Harald K. Wimmer

A Strong Separation Principle for Stochastic Control Systems Driven
by a Hidden Markov Model
Raymond Rishel

Optimal Switching in an Economic Activity Under Uncertainty
Kjell Arne Brekke and Bernt Oksendal

L-infinity-Exact Observability of the Heat Equation with Scanning
Pointwise Sensor
Alexander Khapalov

Boundary Control of a One-Dimensional Linear Thermoelastic Rod
Scott W. Hansen

Control of Infinite Behavior of Finite Automata
J. G. Thistle and W. M. Wonham

Supervision of Infinite Behavior of Discrete-Event Systems
J. G. Thistle and W. M. Wonham

A Version of Olech's Lemma in a Problem of the Calculus of
Variations
Arrigo Cellina and Sandro Zagatti

Characterization of the L2-Induced Norm for Linear Systems with
Jumps with Applications to Sampled-Data Systems
N. Sivashankar and Pramod P. Khargonekar


The Equivalence of Extremals in Different Representations of
Unbounded Control Problems
J. Warga and Q. J. Zhu

Controllability of a System of Two Symmetric Rigid Bodies in Three
Space
Michael J. Enos

Optimal Angular Velocity Tracking with Fixed-Endpoint Rigid Body
Motions
Michael J. Enos

Erratum: On the Optimal Tracking Problem
Ofer Zeitouni and Moshe Zakai