A survey of theories for mobile agents
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We present a study of the interaction properties of objects in concurrent object oriented programming. We identify a set of basic interaction mechanisms: object identity, asynchronous message passing, implicit receive primitive, which are closed to those of the actor model. Then, we define a minimal algebra of actors as a basic formalism for representing the semantics of concurrent object oriented programming. Finally, we define a notion of observation equivalence between the actor terms of the algebra which has been proved to be a congruence with respect to the parallel composition operator.