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

⊦ downcase('B') = 'b', pos('A', sortedchars) ≤ pos('B', sortedchars) ∧ pos('B', sortedchars) ≤ pos('Z', sortedchars)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ pos('A', sortedchars) = 28
Proof step 6:
⊦ downcase('B') = 'b', 28 ≤ pos('B', sortedchars) ∧ pos('B', sortedchars) ≤ pos('Z', sortedchars)

Rule argument

spec: string-less inst: name: pos-A seq: ⊦ pos('A', sortedchars) = 28 subst: flags: rewrite

Additional information

Used terms: