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Proof step 4 from proof rmtoobigpos (previous step)

# x0 < n, ∀ n. # x0 ≤ n → x0 -1l n = x0 ⊦ (a ' + x0) -1l n = a ' + x0, n = 0

User applied rule constructor cut

And obtained the following new goals

Proof step 5:
n = n0 +1, # x0 < n, ∀ n. # x0 ≤ n → x0 -1l n = x0 ⊦ (a ' + x0) -1l n = a ' + x0, n = 0

Rule argument

var: n

Additional information

Used simplifier rules: nat freely generated by 0, +1;;