Search for blocks/addresses/...

Proofgold Proof

pf
Let x0 of type ι be given.
Apply set_ext with binunion x0 x0, x0 leaving 2 subgoals.
Let x1 of type ι be given.
Assume H0: x1binunion x0 x0.
Apply binunionE with x0, x0, x1, x1x0 leaving 3 subgoals.
The subproof is completed by applying H0.
Assume H1: x1x0.
The subproof is completed by applying H1.
Assume H1: x1x0.
The subproof is completed by applying H1.
Let x1 of type ι be given.
Assume H0: x1x0.
Apply binunionI1 with x0, x0, x1.
The subproof is completed by applying H0.