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Set operations and emptiness



Hi All,

I'm currently learning TLA+ and I met a problem that how can I check set emptiness?.

I have two sets A and B.
In every step, AB should be an empty set.
So after writing TLA specification, I would like to add this as an Invariant property. For doing this I wrote following code. But it doesn't work :-(

setInvariant == A \cap B = {}



-Regards

Nikhila K N