On Thursday, February 11, 2021 at 4:55:39 AM UTC-5 martin...@xxxxxxxxxxxxxx wrote:
Hello,
Just a remark if you are designing your Next state relation: this is often
written as a disjunction of actions (which makes non-determinism possible). What
you might want to write could be along the lines of:
\/ (x /\ y /\ z' = 42)
\/ (x /\ ~y /\ z' = 11)
\/ (~x /\ z' = 23)
This amounts to stating "if x and y hold, then the next value of z is 42, if x
but not y holds, then the next value of z is 11; if x does not hold then the
next value of z is 23". In this example all cases are mutually exclusive but
that's not necessary (e.g. just remove the /\ y from the first line).
hope this helps! kind regards,
Martin
On 2/10/21 9:31 PM, Anshu ranjan wrote:
> Hi, I have a beginner's question:
> If I want to write the following clause:
>
> IF x=true and y=true
> THEN do z
>
> How can write this in TLA+? Specifically how do I write the and operator?
>
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