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| INIT Init | |
| NEXT Next | |
| INVARIANT Inv |
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| ---- MODULE Simple ---- | |
| VARIABLE v, n | |
| Init == | |
| /\ v \in {TRUE, FALSE} | |
| /\ n = 0 | |
| Next == | |
| /\ v' \in {TRUE, FALSE} | |
| /\ n' = n + 1 | |
| Inv == | |
| /\ n = 3 | |
| /\ v = TRUE | |
| ==================== |
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Counterexample ends in a state s.t.
n = 3 /\ v = FALSE.