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Proof step 6 from proof upcase-a (previous step)

83 < pos('a', sortedchars) ⊦ upcase('a') = 'A'

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ pos('a', sortedchars) = 58

Rule argument

spec: string-less inst: name: pos-a seq: ⊦ pos('a', sortedchars) = 58 subst: flags: rewrite

Additional information

Used terms: