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

[Guo Hua <fchdir@xxxxxxxxx>]

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

-- 
You received this message because you are subscribed to the Google Groups "tlaplus" group.
To unsubscribe from this group and stop receiving emails from it, send an email to tlaplus+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/bb7d6e3f-6731-4b08-bb7d-717df3834e4fn%40googlegroups.com.