Let x0 of type ι be given.
Let x1 of type ι be given.
Apply set_ext with
d3786.. x0 x1,
x0 leaving 2 subgoals.
The subproof is completed by applying unknownprop_8f5bf12cfaed0ffd6b0b2703f40521e4f47dbe14ca71e17ebdcebdd96c630d67 with x0, x1.
Let x2 of type ι be given.
Apply unknownprop_0eb2245dc687a56a5adef9ad3fc675715803356fcfbd14168f93f22b67fac4c1 with
x0,
x1,
x2 leaving 2 subgoals.
The subproof is completed by applying H1.
Apply H0 with
x2.
The subproof is completed by applying H1.