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Proof step 4 from proof val-trans (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
str2 < str3, char ' + str0 < str2, ∀ str2, str3. str2 < str3 ∧ str0 < str2 → str0 < str3 ⊦ char ' + str0 < str3

Rule argument

Additional information

Used simplifier rules: ⊦ char + str = char ' + str; (s)