[tlaplus] specify two different elements in a set

[Han <keepsimple@xxxxxxxxx>]

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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