Re: [tlaplus] How to express this set comprehension in TLA+?

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

Hello Hengxin,

The { e: x \in S} pattern is treated differently, you need to move the domain
constraints to the front:

P == { <<x,y>> \in 1..2 \X 1..2 : x # y }

Please refer also to the Specifying Systems book p.299 where you can see the
different shapes. I hope that helps :)

kind regards,
Martin

On 4/5/21 11:34 AM, hengx...@xxxxxxxxx wrote:
> I want to express the following set comprehension (as a simplied example)
> 
> {<<x, y>> : x \in 1 .. 2, y \in 1 .. 2, y # x}
> 
> in TLA+ and expect the result {<<1, 2>>, <<2, 1>>}.
> Note that the third condition "y # x" uses variable "x".
> 
> However, I got a parse error.
> 
> How should I correctly express it in TLA+?
> 
> Best regards,
> hengxin
> 
> 
> -- 
> 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
> <mailto:tlaplus+unsubscribe@xxxxxxxxxxxxxxxx>.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/tlaplus/dbff9f03-c5bf-45cc-a9f9-b361b98cb278n%40googlegroups.com
> <https://groups.google.com/d/msgid/tlaplus/dbff9f03-c5bf-45cc-a9f9-b361b98cb278n%40googlegroups.com?utm_medium=email&utm_source=footer>.

-- 
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/8d1e613f-b0b4-eaee-2ad0-796ccf5bf0c6%40gmail.com.