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Logic  /  Logic 220  ·  Atom · ~20 seconds

The Common Proof Errors

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The recurring five: Simp on a non-conjunction; inference rules applied to *parts* of lines; citing discharged lines; DS by affirming; negation mismatches unfixed by DN.

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Each shown in a single wrong line with the error circled.

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Every one of these is a valid rule applied where its conditions don't hold. The rules are never wrong; the reach is.

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