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Proof step 1 from proof zero-02 (conclusion)

⊦ m ≤ n → (n - m = 0 ↔ n = m)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: zero: ⊦ m - m = 0;%lels-02: ⊦ m ≠ n → (m ≤ n ↔ m < n);%zero-01: ⊦ n < m → m - n ≠ 0;