Mathematical Characterization Using Domain Theory
Finally eight years after the first Actor publication, Will Clinger (building on the work of Irene Greif 1975, Gordon Plotkin 1976, Michael Smyth 1978, Henry Baker 1978, Francez, Hoare, Lehmann, and de Roever 1979, and Milne and Milnor 1979) published the first satisfactory mathematical denotational model incorporating unbounded nondeterminism using domain theory in his dissertation in 1981 (see Clinger's model). Subsequently Hewitt augmented the diagrams with arrival times to construct a technically simpler denotational model that is easier to understand. See History of denotational semantics.
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