Re: [tlaplus] Is p=> p' a legal TLA+ formula?

[Stephan Merz <stephan.merz@xxxxxxxxx>]

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 <wpkzxp@xxxxxxxxx> 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

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