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Proof step 2 from proof pos-str-02 (previous step)

str ≠ "", char ≠ str.char1 ⊦ pos(char, str) = pos(char, str.rstring) + 1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ pos(char, str) = pos(char, str.rstring) + 1, char = str.char1, str = ""

Rule argument

Additional information