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Proof step 3 from proof test-downcaseFirst (previous step)

⊦ downcaseFirst('A' + "BCabc012") = "aBCabc012"

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ downcaseFirst(char + str) = downcase(char) + str
Proof step 5:
⊦ downcase('A') + "BCabc012" = "aBCabc012"

Rule argument

spec: inst: name: String-downcaseFirst-def seq: ⊦ downcaseFirst(char + str) = downcase(char) + str subst: [str, char] → ["BCabc012", 'A'] flags: rewrite, current

Additional information

Used terms: "BCabc012", 'A'