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Proof step 3 from proof val-irref (previous step)

¬ str < str, char + str < char + str ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
char ' + str < char ' + str ⊦ str < str

Rule argument

Additional information

Used simplifier rules: chartostring-01: ⊦ char + str = char ' + str; from specification string-append