Re: [tlaplus] Does verifying parts of the initial state separately affect correctness?

Hi, Stephan.

I should've been more precise when writing my question, but you got it perfectly.

I split Init into two (or more) mutually-exclusive sets, such as

Init1 == var \in {0, 1, 2}

Init2 == var \in {4, 5, 6}

Init == Init1 \/ Init2

then run Spec == Init1 /\ [][Next]_vars /\ Fairness,

then run Spec == Init2 /\ [][Next]_vars /\ Fairness, etc;

such that running all specs would return the same as running Spec == Init /\ [][Next]_vars /\ Fairness + Temporal Properties

On Tue, 22 Feb 2022 at 04:28, Stephan Merz <stephan.merz@xxxxxxxxx> wrote:

Hello,

if I understand correctly, you generate two (or more) specifications of the form

S1 == Init /\ P /\ [][Next]_vars /\ L

S2 == Init /\ Q /\ [][Next]_vars /\ L

such that Init => P \/ Q, and verify that both S1 and S2 have some property F. Your question is if this ensures that

S == Init /\ [][Next]_vars /\ L

also ensures property F, and this is clearly the case. Note however that the two separate model checking runs for S1 and S2 may (collectively) take longer than a single model checking run for S because the state spaces of S1 and S2 may (and in general will) overlap.

Stephan

On 22 Feb 2022, at 00:45, Jones Martins <jonesmvc@xxxxxxxxx> wrote:

Hi everyone,

This question might have an obvious answer, but I'd like to make sure.

To clarify: Instead of running an hour-long verification process, I split my initial states in groups so that I could tackle the fastest groups first.

Suppose that verifying all such groups returns no errors, is it possible for TLC not to find a mistake because it didn't run with the entire state space at once?

Thanks,

Jones

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