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Proof step 2 from proof s2n-char-01 (previous step)

# str = 1 ⊦ s→n(str) = pos(str.char1, '0' ' + '1' ' + '2' ' + '3' ' + '4' ' + '5' ' + '6' ' + '7' ' + '8' ' + '9' ')

User applied rule structural induction

And obtained the following new goals

Proof step 3:
# str0 = 1 → s→n(str0) = pos(str0.char1, '0' ' + '1' ' + '2' ' + '3' ' + '4' ' + '5' ' + '6' ' + '7' ' + '8' ' + '9' '), #(char + str0) = 1 ⊦ s→n(char + str0) = pos((char + str0).char1, '0' ' + '1' ' + '2' ' + '3' ' + '4' ' + '5' ' + '6' ' + '7' ' + '8' ' + '9' ')

Rule argument

indvar: str

Additional information

Used simplifier rules: string freely generated by "", +;;% ⊦ # "" = 0;