Is p=> p' a legal TLA+ formula?

[宏黄]

When I read the TLA1 and INV1 rules, I was confused 

P is a predicate, then P' is an action,an action cannot occur in this form

[Stephan Merz]

If P is a state predicate then P => P’ is an action formula (but not a temporal formula). As such, it may occur as a hypothesis of proof rules such as INV1, even if their conclusion is a temporal formula. 

Stephan

On 4 Nov 2021, at 03:06, 宏黄 <wpk...@gmail.com> wrote:

When I read the TLA1 and INV1 rules, I was confused 

P is a predicate, then P' is an action,an action cannot occur in this form

--
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+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/b104a905-3eb5-4a14-b468-5470fc75c35fn%40googlegroups.com.