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Denotational semantics
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==Semantics versus implementation== According to Dana Scott (1980):<ref>"What is Denotational Semantics?", MIT Laboratory for Computer Science Distinguished Lecture Series, 17 April 1980, cited in Clinger (1981).</ref> :''It is not necessary for the semantics to determine an implementation, but it should provide criteria for showing that an implementation is correct.'' According to Clinger (1981):<ref name="clinger1981">{{cite thesis |degree=PhD |first=William D. |last=Clinger |title=Foundations of Actor Semantics |date=May 1981 |publisher=Massachusetts Institute of Technology |id=AITR-633 |hdl=1721.1/6935 |hdl-access=free}}</ref>{{rp|79}} :''Usually, however, the formal semantics of a conventional sequential programming language may itself be interpreted to provide an (inefficient) implementation of the language. A formal semantics need not always provide such an implementation, though, and to believe that semantics must provide an implementation leads to confusion about the formal semantics of concurrent languages. Such confusion is painfully evident when the presence of unbounded nondeterminism in a programming language's semantics is said to imply that the programming language cannot be implemented.''
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