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Logic  /  Logic 343  ·  Atom · ~20 seconds

Necessary and Sufficient Causes

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A necessary cause must be present for the effect; a sufficient cause guarantees it. Most causes of interest are neither alone — they're contributing conditions.

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Oxygen: necessary for the fire, sufficient for nothing.

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"The" cause is usually a selection from a causal field, picked out by our interests. The insurance report and the fire marshal may both be right.

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  • Nothing yet depends on this.