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

∀ str2. str0 = str2 ∨ str0 < str2 ∨ str2 < str0 ⊦ char + str0 = str2, char + str0 < str2, str2 < char + str0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
∀ str2. str0 = str2 ∨ str0 < str2 ∨ str2 < str0 ⊦ char ' + str0 = str2, char ' + str0 < str2, str2 < char ' + str0

Rule argument

Additional information

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