Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Assume H1:
ap x1 x3 = x2.
Apply unknownprop_4270b0e920f6ab49c5577490ca19e4c5c6282a2ea155f48817cbf066c86da489 with
x0,
x1,
x3,
λ x4 x5 . x5 = x2 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.