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*From*: "c.burge...@xxxxxxxxx" <c.burge.glasgow@xxxxxxxxx>*Date*: Fri, 30 Apr 2021 05:46:19 -0700 (PDT)*Ironport-hdrordr*: A9a23: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*References*: <f06df008-8efa-4942-bb93-a2ebbbfe7984n@googlegroups.com>

Also tried stating it as :

y ~0 -> y'= y-1, same error

On Friday, April 30, 2021 at 1:39:23 PM UTC+1 c.burge...@xxxxxxxxx wrote:

Hi 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!

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**References**:**[tlaplus] What's wrong with this temporal formula?***From:*c.burge...@xxxxxxxxx

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