(y=0 /\ y' = 0) \/ (y # 0 /\ y' = y-1)
But when I put this as a property in TLC, I get the error:
"The property ... is not correctly defined."
Hello,1. "not equal" is written # in TLA+ (or /=), "~" is Boolean negation.2. I believe "->" represents implication in your formula, but it is written "=>" in TLA+.3. The expressions on both sides of an implication should be Boolean, but the _expression_ on the right-hand side is y-1.4. The (action) formula corresponding to your informal statement can be written as\/ y' = 0\/ y # 0 /\ y' = y-1A similar formula (but with a slightly different meaning) isy' = IF y # 0 THEN y-1 ELSE 0StephanHi again!
I have the following temporal formula:
y'= 0 \/ y ~0 -> y-1
Which I hope says that the next value of y is zero or y-1 if y is not zero.
However, when I put this as a property in TLC, I get the error:
Was expecting ===== or more module body, encountered '~' in Properties at line 1 and token 'y'.
Obviously it's not happy with the ~ (equally unhappy with \lnot), but I'm not sure how to proceed from here!--
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...@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/f06df008-8efa-4942-bb93-a2ebbbfe7984n%40googlegroups.com.