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

∀ str2, str3. str0 < str2 ∧ str2 < str3 → str0 < str3, char + str0 < str2, str2 < str3 ⊦ char + str0 < str3

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
str2 < str3, char ' + str0 < str2, ∀ str2, str3. str0 < str2 ∧ str2 < str3 → str0 < str3 ⊦ char ' + str0 < str3

Rule argument

Additional information

Used simplifier rules: c: ⊦ char + str = char ' + str; from specification list[string-new]