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Proof step 18 from proof downcase-B (previous step)

58 = n0 + pos('A', sortedchars) ∧ pos('A', sortedchars) ≤ 58, pos('A', sortedchars) ≤ 29, 29 ≤ pos('Z', sortedchars), pos('A', sortedchars) ≤ pos('Z', sortedchars) ⊦ s→l(sortedchars)[29 + n0] = 'b', pos('Z', sortedchars) = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 19:
58 = n0 + pos('A', sortedchars), pos('A', sortedchars) ≤ pos('Z', sortedchars), 29 ≤ pos('Z', sortedchars), pos('A', sortedchars) ≤ 29, pos('A', sortedchars) ≤ 58 ⊦ pos('Z', sortedchars) = 0, s→l(sortedchars)[29 + n0] = 'b'

Proof step 18 from proof downcase-B (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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