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.
Show
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.