Let x0 of type ι be given.
Let x1 of type ι → ι → ι be given.
Let x2 of type ι be given.
Apply explicit_Group_inverse_prop with
x0,
x1,
x2,
prim1 (explicit_Group_inverse x0 x1 x2) x0 leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.