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Re: Temporal property

Dear Stefan, thank you for quick answer!

If possible, some more questions (should I create new topics for it?):


- how TLC distinguish between assignment and comparison? E.g. use of x` = 1 in the action definition will be considered as assignment, but as comparison in a temporal property? Can primed variables be used in condition statements in the definition of actions?


- what is necessity of if-then-else operator if conditionality can be naturally expressed with FOL?


- work of print function is quite confusing. I understand that output depends on internal TLC algorithm, so please advise where I may read more about print?


- how TLA+ supports modelling of concurrent systems - parallelism, synchronisation, atomic operations? There are no corresponding keywords in TLA+.

Thanks again,

On Wednesday, November 2, 2016 at 3:40:51 PM UTC+8, vit...@xxxxxxxxxx wrote:
Hi, is it possible in TLA to specify and check the property linking values of current and next states, like Prop == (x = 1) => (y` = 2). Seems to be the operation "=" for primed variables (as e.g. y') will be considered as assignement, but not comparison? Tq.