Re: [tlaplus] Merging EXCEPT statements

Hi,

Saksham already pointed out how to update a function at several argument positions. Writing

/\ a' = [a EXCEPT ![x] = foo]

/\ a' = [a EXCEPT ![y] = bar]

implies that

[a EXCEPT ![x] = foo] = [a EXCEPT ![y] = bar]

which is unlikely to be true, which explains why you see line count 0 in TLC.

Stephan

On 10 Sep 2019, at 09:51, jacky.hoang93@xxxxxxxxx wrote:

Hello,

Suppose I have a function a, that has domain Z. Suppose x and y are in Z.
I'm writing an action where both a[x] and a[y] must be changed.

I have one line of the following form:

a' = [a EXCEPT ![x] = ...]

and another like so:

a' = [a EXCEPT ![y] = ...]

How would I be able to write this altogether as one? Having both doesn't seem to work with Model Checking as count = 0 for those lines.

I apologize if I'm using the wrong terms to explain my problem.

Thanks for any help

--
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+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/b62bc163-64e5-46be-9c73-f80db1f553a4%40googlegroups.com.

--
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+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/81EF6792-E7E3-46D5-BEEA-C58CD2ACE76E%40gmail.com.