Necessary or Sufficient Conditions.docx
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Necessary or Sufficient Conditions
Sufficient Condition: A condition A is said to be sufficient for a condition B, if (and
only if) the truth of A guarantees the truth of B (A square has four sides therefore
it is a square)
Necessary Condition: A condition A is said to be necessary for a condition B, if
(and only if) the falsity of A guarantees the falsity of B (Air is necessary for human
“no ought from an is”
-normative: value loaded by definition (is the norm)
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