Speciication in Ctl+past for Veriication in Ctl


We describe PCTL, a temporal logic extending CTL with connectives allowing to refer to the past of a current state. This incorporates the new N, \From Now On", combinator we recently introduced. PCTL has branching future but determined, nite and cumulative past. We argue this is the right choice for a semantical framework, and show this through an extensive… (More)


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