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Proof step 6 from proof downcase-C (previous step)

⊦ downcase('C') = 'c', 28 ≤ pos('C', sortedchars) ∧ pos('C', sortedchars) ≤ pos('Z', sortedchars)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ pos('C', sortedchars) = 30
Proof step 8:
⊦ downcase('C') = 'c', 28 ≤ 30 ∧ 30 ≤ pos('Z', sortedchars)

Rule argument

spec: string-less inst: name: pos-C seq: ⊦ pos('C', sortedchars) = 30 subst: flags: rewrite

Additional information

Used terms: