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Proof step 66 from proof n2s-zero (previous step)

'7' ' + '8' ' + '9' ' ≠ [] ∧ m ≠ 0, ('7' ' + '8' ' + '9' ').rest[m - 1] ' = "0", m < 3 ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 67:
('8' ' + '9' ')[m - 1] ' = "0", m < 3 ⊦ m = 0

Rule argument

Additional information

Used simplifier rules: e-01: ⊦ char ' + chars ≠ []; from specification list[charlist]%a: ⊦ (chars + chars0) + chars1 = chars + chars0 + chars1; from specification list[charlist]%c-07: ⊦ (char ' + chars).rest = chars; from specification list[charlist]