Abstract
Dijkstra and Scholten (1990) present an axiomatic semantics for Dijkstra's guarded command language through the notions of weakest precondition and weakest liberal precondition. The informal notion of a computation is used as a justification for the various definitions. In this paper we present an operational semantics in which the notion of a computation is made explicit. The novel contribution is a generalization of the notion of weakest precondition. This generalization supports reasoning about general properties of programs (i.e. not just termination in a certain state) and we introduce two properties in this way.
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