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[tlaplus] Re: Proving false with fairness
Thank you for your precise explanation.
In the first case, I did not plan to write a non machine closed specification : it was a typo in a formula that was responsible for it.
For the second case, during my 15+ years of using TLA+, I had used Constraint almost only with invariant properties. I was aware that a invalid safety property could be reported as valid (as less states are explored) or that a valid liveness property could be reported as invalid (if the relevant states were excluded). I hadn't stopped to think that an invalid liveness property could also be reported as valid, my mistake. I guess I had forgotten about Section 14.3.5 (Limitations of Liveness Checking).
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