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Proof step 10 from proof downcase-lower-a (previous step)

58 ≤ pos('Z', sortedchars), 28 ≤ pos('Z', sortedchars) ⊦ downcase('a') = 'a', pos('Z', sortedchars) = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: string-less inst: name: pos-Z seq: ⊦ pos('Z', sortedchars) = 53 subst: flags: rewrite

Additional information

Used terms: