is a predicate that characterizes this set of states. Use of the adjective weakest explicitly indicates that the predicate must characterize all states that guarantee termination of S in a state for which R is true.
The term was introduced by Dijkstra in 1975 in conjunction with a calculus for the derivation of programs; this provides for development of a program to be guided by the simultaneous development of a total correctness proof for the program. See program correctness proof, predicate transformer.
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