Algebraic specification of reactive systems

We present an algebraic method for the equational specification of reactive distributed systems. We define a mathematical concept of specifications of reactive components in terms of predicates. A component specification is a predicate that describes a set of behaviours. A deterministic component ha s exactly one behaviour. A component behaviour is represented by a stream p rocessing function. We introduce operations on behaviours and lift them to specifications leading to mt algebra of system specifications in analogy to the process algebras that provide algebras of reactive programs. However, in contrast to the purely axiomatic description of process algebras we use algebraic equations to specify components and not to formalise composition operators. We show how algebraic system specifications can be used as an al gebraic and logical basis for state automata specifications and state trans ition diagrams. (C) 2000 Elsevier Science B.V. All rights reserved.