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Proof step 2 from proof l-num-05 (previous step)

n < n0 ⊦ m + n < n0 ↔ m < n0 - n

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: le-def: ⊦ m ≤ n ↔ ¬ n < m;%ls: n0 ≤ n ⊦ m < n - n0 ↔ m + n0 < n;% ⊦ m < n → ¬ n < m; (s)