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Proof step 1 from proof natstring-chars (conclusion)

⊦ ¬ char ∈ "0123456789" → ¬ char ∈ n→s(m)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
char ∈ n→s(m) ⊦ char ∈ "0123456789"

Rule argument

Additional information