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Proof step 3 from proof dist-c (previous step)

¬ n < m ⊦ dist(m, n) = dist(n, m)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
m ≤ n ⊦ dist(m, n) = dist(n, m)

Rule argument

Additional information

Used simplifier rules: lels: ⊦ ¬ m < n ↔ n ≤ m; from specification nat