Scheme
Gerald Sussman and Guy Steele then took an interest in Actors and published a paper on their Scheme interpreter in which they (misleadingly) concluded "we discovered that the 'actors' and the lambda expressions were identical in implementation." The actual situation is that the lambda calculus is capable of expressing some kinds of parallelism but, in general, not the concurrency expressed in the Actor model. On the other hand, the Actor model is capable of expressing all of the parallelism in the lambda calculus.
Read more about this topic: History Of The Actor Model
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