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Proof step 2 from proof one-01 (previous step)

char ' = "" ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ char ' = char + ""

Rule argument

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

Additional information

Used simplifier rules: empty: ⊦ char + str ≠ ""; from specification string-data Used terms: char