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Proof step 4 from proof s2n-char-01 (previous step)

⊦ s→n(char ') = pos(char, '0' ' + '1' ' + '2' ' + '3' ' + '4' ' + '5' ' + '6' ' + '7' ' + '8' ' + '9' ')

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: string2nat inst: name: s2n-char seq: ⊦ s→n(char ') = pos (char, '0' + '1' + '2' + '3' + '4' + '5' + '6' + '7' + ('8' + '9')) subst: [char] → [char] flags: rewrite, current

Additional information

Used simplifier rules: ⊦ (chars + chars0) + chars1 = chars + chars0 + chars1;% ⊦ char + char0 = char ' + char0 ';% ⊦ char + chars = char ' + chars; Used terms: char