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

pos('Z', sortedchars) < pos('A', sortedchars) ⊦ downcase('A') = 'a'

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ pos('Z', sortedchars) = 53
Proof step 6:
53 < pos('A', sortedchars) ⊦ downcase('A') = 'a'

Rule argument

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

Additional information

Used terms: