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Proof step 22 from proof downcase-B (previous step)

29 ≤ pos('Z', sortedchars), 28 ≤ pos('Z', sortedchars) ⊦ pos('Z', sortedchars) = 0, s→l(sortedchars)[59] = 'b'

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: string-less inst: name: Sortedchars seq: ⊦ sortedchars = "!#$%&()*+-./0123456789:<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz|~" subst: flags: rewrite

Additional information

Used simplifier rules: str ≠ "" ⊦ s→l((* str)) = str.char1 ' + s→l(str.rstring);% ⊦ s→l("") = [];% ⊦ chars + [] = chars;% ⊦ (chars + chars0) + chars1 = chars + chars0 + chars1;%n ≠ 0 ⊦ (char ' + chars)[(* n)] = chars[n -1];% ⊦ (char ' + chars)[0] = char; Used terms: