pv
This command enables to go to the first previous unproved proof obligations, if there is one. If there is no more unproved proof obligation left, command pv is ineffective.
The component have 2 operations, 1 proved proof obligation and 3 unproved proof obligations. By launching the gs command, we get the following situation:
PRI> gs State of all PO Initialisation PO1 Proved not(e5 = e1) PO2 Unproved e1 = e5 Calculus PO1 Unproved not(e2 = e5) PO2 Unproved e5 = e1 End
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Let suppose that the current proof operation is Calculus.1. The user goes to the first previous unproved obligation.
PRI> pv Current PO : Initialisation.2
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By repeating the command, we go to proof obligation Calculus.2.
PRI> pv Current PO : Calculus.2
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