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

str2 < str3, str < str2 ⊦ str < str3

User applied rule structural induction

And obtained the following new goals

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

Rule argument

indvar: str

Additional information

Used simplifier rules: less-empty: ⊦ "" < str ↔ str ≠ "";%Less-notempty: ⊦ ¬ str < "";%string freely generated by "", +;;