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Logic  /  Logic 127  ·  Atom · ~20 seconds

Necessary vs. Sufficient Conditions

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State

A sufficient condition sits in the antecedent; a necessary condition sits in the consequent.

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Oxygen is necessary for fire — Fire ⊃ Oxygen. It is nowhere near sufficient.

Watch for

Necessary-versus-sufficient confusion drives real disasters: mistaking a required condition for a guaranteeing one.