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Proofgold Proof

pf
Let x0 of type ι be given.
Apply set_ext with setminus x0 0, x0 leaving 2 subgoals.
The subproof is completed by applying setminus_Subq with x0, 0.
Let x1 of type ι be given.
Assume H0: x1x0.
Apply setminusI with x0, 0, x1 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying EmptyE with x1.