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Proof step 1 from proof insorted (conclusion)

⊦ ¬ pos(char, sortedchars) < # sortedchars ↔ false

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
# sortedchars ≤ pos(char, sortedchars) ⊦

Rule argument

Additional information

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