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SEMANTICS: a distinguishing property of singular definite descriptions. The sentence The present king of France is bald entails that there is a king of France (existence) and that there is exactly one (uniqueness). A point of debate has been the question whether existence and uniqueness should be treated as part of the assertion (as Russell did) or as a presupposition (as Strawson proposed).
LIT. Russell, B. (1905)
Strawson (1950)