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'''Predicate transformer semantics''' is an extension of [[Hoare logic|Floyd-Hoare Logic]] invented by [[Edsger W. Dijkstra|Dijkstra]] and extended and refined by other researchers. It was first introduced in Dijkstra's paper "Guarded commands, nondeterminacy and formal derivation of programs". It is a method for defining the semantics of an [[Imperative_programming|imperative programming]] language by assigning to each ''command'' in the language a corresponding ''predicate transformer''. A ''[[predicate transformer]]'' is a [[total function]] mapping between two ''[[
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