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Proof step 2 from proof pos-str (
previous step
)
⊦ str ≠ "" ∧ char = str.char1 → pos(char, str) = 0
Heuristic simplifier applied rule simplifier
And obtained the following new goals
Proof step 3
:
⊦ pos(str.char1, str) = 0, str = ""
Rule argument
Additional information