Let x0 of type ι be given.
Apply unknownprop_872273e895264b163d3a3b042c5d1abf262e26919401a643ccce2dcdcb6a14ef with
x0,
λ x1 x2 . x1 ∈ e523d...
Apply unknownprop_ab5523330112f607e055e625ca3ec71bcb7369b53cba9b5f845ed34015ce25b3 with
x0,
0 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying real_0.