Re: [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?

[Markus Kuppe <tlaplus-google-group@xxxxxxxxxxx>]

Perhaps, ENALBED Next is what you are looking.

M.

> On Dec 2, 2023, at 10:58 PM, Guo Hua <fchdir@xxxxxxxxx> 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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