Preface These note s expan d te n lecture s give n a t a regiona l conferenc e i n Lincoln , Nebraska. Th e objective is to describe the idea behind a broad variety of topics in a brief volume. Th e conference assemble d a wide variety o f scientists: pur e mathematicians o n one hand an d engineer s on the other. Consequentl y on e of the constraints o n thes e note s wa s tha t the y stak e ou t a middl e groun d an d make th e extreme s accessibl e t o mos t conferenc e participants . However , thes e extremes provide d a distinctiv e flavor which i s missin g fro m thes e notes . I n particular talk s by other participants gav e substantial practic e i n applying th e results of Chapter 5 and Chapter 8 to control problems. This volume splits into four parts which are nearly independent. A n approxi- mate description of what you must have read in order to read a particular chapter is: -tU-HZl Part I Part I -*GD SKETCHY NO PROOFS (proofs use 5)
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