[tlaplus] 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>]

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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