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Proof step 4 from proof downcase-rec (previous step)

⊦ char ' + str0 = "", downcase(char ' + str0) = downcase(char) ' + downcase(str0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ char + str = char ' + str
Proof step 6:
⊦ char + str0 = "", downcase(char + str0) = downcase(char) ' + downcase(str0)

Rule argument

spec: string-append inst: name: chartostring-01 seq: ⊦ char + str = char ' + str subst: [str, char] → [str0, char] flags: rewrite

Additional information

Used terms: str0, char