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Proof step 2 from proof less-empty (previous step)

⊦ str = "", "" < str

User applied rule structural induction

And closed the goal!

Rule argument

indvar: str

Additional information

Used simplifier rules: Less-empty: ⊦ "" < char ' + str;%string freely generated by "", +;;%chartostring-01: ⊦ char + str = char ' + str; from specification string-append%assoc: ⊦ (str1 + str2) + str3 = str1 + str2 + str3; from specification string-append