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Proof step 7 from proof less-append (previous step)

∀ str0. str0 = "" ∨ str1 < str1 + str0 ⊦ str0 = "", char + str1 < (char + str1) + str0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
∀ str0. str0 = "" ∨ str1 < str1 + str0 ⊦ str0 = "", str1 < str1 + str0

Rule argument

Additional information

Used simplifier rules: Less-rec: ⊦ char1 ' + str1 < char2 ' + str2 ↔ char1 < char2 ∨ char1 = char2 ∧ str1 < str2;%Char-irref: ⊦ ¬ char < char;%assoc: ⊦ (str1 + str2) + str3 = str1 + str2 + str3; from specification string-append%chartostring-01: ⊦ char + str = char ' + str; from specification string-append