Re: [tlaplus] AND operator

["'Martin' via tlaplus" <tlaplus@xxxxxxxxxxxxxxxx>]

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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