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Proof step 2 from proof one (previous step)

char1 ' + str1 = char2 ' + str2 ⊦ char1 = char2 ∧ str1 = str2

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ char + str = char ' + str
Proof step 4:
char1 + str1 = char2 ' + str2 ⊦ char1 = char2 ∧ str1 = str2

Rule argument

spec: string-append inst: name: chartostring-01 seq: ⊦ char + str = char ' + str subst: [str, char] → [str1, char1] flags: rewrite, current

Additional information

Used terms: str1, char1