specify two different elements in a set

[Han]

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

[Stephan Merz]

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

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[Han]

Thanks Stephan.

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