# Re: [tlaplus] specify two different elements in a set

Thanks Stephan.

On Fri, Sep 6, 2019 at 12:37 AM Stephan Merz <stephan.merz@xxxxxxxxx> wrote:
Your way of writing the formula is fine. Logically equivalent formulations are

\A x,y \in Nodes : x # y => ...
\A x \in Nodes : \A y \in Nodes \ {x} : ...

Regards,
Stephan

On 6 Sep 2019, at 00:01, Han <keepsimple@xxxxxxxxx> wrote:

Hi,

What's the proper way of specifying any two different elements from a set?  Currently I am doing something like this (i.e. check x = y in addition to real conditions)

Inv == /\ \A x, y \in Nodes: (x = y \/ values[x] \cap values[y] = {})

(values is not relevant here)

I'm curious, Is there a more concise way?

thanks.
Han

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