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Proof step 8 from proof fle (previous step)

m < n, n ≤ n0, n0 ≤ m, ¬ m < n0 → ¬ n < n0 ⊦ n = 0

User applied rule case distinction

And obtained the following new goals

Proof step 9:
m < n, n ≤ n0, n0 ≤ m ⊦ ¬ m < n0, n = 0
Proof step 12:
¬ n < n0, m < n, n ≤ n0, n0 ≤ m ⊦ n = 0

Rule argument

pos: left 4

Additional information