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Proof step 1 from proof rest-one (conclusion)

⊦ char '.rstring = ""

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ char ' = char + ""

Rule argument

spec: string-append inst: name: chartostring seq: ⊦ char ' = char + "" subst: [char] → [char] flags: rewrite, current

Additional information

Used simplifier rules: sel-02: ⊦ (char + str).rstring = str; from specification string-data Used terms: char