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Proof step 4 from proof upcase-a (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ pos('z', sortedchars) = 83
Proof step 6:
83 < pos('a', sortedchars) ⊦ upcase('a') = 'A'

Rule argument

spec: string-less inst: name: pos-z seq: ⊦ pos('z', sortedchars) = 83 subst: flags: rewrite

Additional information

Used terms: