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Proof step 6 from proof prefix-num-01 (previous step)

str0 = char0 + str2, char ' + str1 ⊑ str0 ⊦ str0 = "", char = char0, char ' + str1 = ""

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
char ' + str1 ⊑ char0 ' + str2 ⊦ char = char0, char ' + str1 = "", char0 ' + str2 = ""

Rule argument

Additional information

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