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.
Let x4 of type ι be given.
Let x5 of type ι be given.
Let x6 of type ι be given.
Let x7 of type ι be given.
Let x8 of type ι be given.
Let x9 of type ι be given.
Apply beta with
10,
λ x10 . If_i (x10 = 0) x0 (If_i (x10 = 1) x1 (If_i (x10 = 2) x2 (If_i (x10 = 3) x3 (If_i (x10 = 4) x4 (If_i (x10 = 5) x5 (If_i (x10 = 6) x6 (If_i (x10 = 7) x7 (If_i (x10 = 8) x8 x9)))))))),
1,
λ x10 x11 . x11 = x1 leaving 2 subgoals.
The subproof is completed by applying unknownprop_1b6aea42dd8dd6467e5f0150bab2b0d6533055acdd61b232a0adb5a2a42e1655.
Apply If_i_0 with
1 = 0,
x0,
If_i (1 = 1) x1 (If_i (1 = 2) x2 (If_i (1 = 3) x3 (If_i (1 = 4) x4 (If_i (1 = 5) x5 (If_i (1 = 6) x6 (If_i (1 = 7) x7 (If_i (1 = 8) x8 x9))))))),
λ x10 x11 . x11 = x1 leaving 2 subgoals.
The subproof is completed by applying neq_1_0.
Apply If_i_1 with
1 = 1,
x1,
If_i (1 = 2) x2 (If_i (1 = 3) x3 (If_i (1 = 4) x4 (If_i (1 = 5) x5 (If_i (1 = 6) x6 (If_i (1 = 7) x7 (If_i (1 = 8) x8 x9)))))).
Let x10 of type ι → ι → ο be given.
Assume H0: x10 1 1.
The subproof is completed by applying H0.