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Apply add_nat_SR with u3, u2, λ x0 x1 . x1 = u6 leaving 2 subgoals.
The subproof is completed by applying nat_2.
Apply add_nat_SR with u3, u1, λ x0 x1 . ordsucc x1 = u6 leaving 2 subgoals.
The subproof is completed by applying nat_1.
Apply add_nat_SR with u3, 0, λ x0 x1 . ordsucc (ordsucc x1) = u6 leaving 2 subgoals.
The subproof is completed by applying nat_0.
Apply add_nat_0R with u3, λ x0 x1 . ordsucc (ordsucc (ordsucc x1)) = u6.
Let x0 of type ι → ι → ο be given.
The subproof is completed by applying H0.
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