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Proof step 4 from proof prefix-num-01 (previous step)

str = char + str1, str ⊑ str0 ⊦ char = str0.char1, str = "", str0 = ""

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
char ' + str1 ⊑ str0 ⊦ str0 = "", char = str0.char1, char ' + str1 = ""

Rule argument

Additional information

Used simplifier rules: ⊦ char + str = char ' + str;