[tlaplus] Re: Does TLA+ have a feature where a certain operator is true if and only if a new, different state is produced in the next action?

[Guo Hua <fchdir@xxxxxxxxx>]

Also, I thought, can I simply achieve this by adding OperatorX to Invariants?

On Sunday, December 3, 2023 at 3:00:17 PM UTC+8 Guo Hua wrote:

Does TLA+ have a feature where a certain operator is true if and only if a new, different state is produced in the next action?

If there are no built-in features like this, could I write new overriding operators or modules to implement this? I need some tips.

Just like in the following example,

OperatorX is true if and only if Next produces a new state. In this case, OperatorX cannot change the state and does not have prime operators.

Next ==
     /\ (\/ Next1
           \/ Next2)
     /\ (NextCanProduceNewState => OperatorX )

Thanks

Hua

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