Flow properties Clause Samples

Flow properties where x S removes all occurrences of events from S in traces of x; En is a set of new events introduced in machine refinement (these events refine an implicit skip event of an abstract machine); R∗ is a function mapping concrete event labels into the labels of abstract events. Note that since a flow selects one of the possible traces of a machine, the combination of a consistent flow and a machine exhibits the failure-divergence refinement in respect to the pair of abstract flow and a machine.This is due to the fact that Event-B refinement is a case of the failure-divergence refinement [12].