# Necessary or Sufficient Conditions.docx

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3 pages79 viewsWinter 2013

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**preview**shows half of the first page. to view the full**3 pages of the document.**Necessary or Sufficient Conditions

necessary/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

life).

“no ought from an is”

normative/descriptive:

-normative: value loaded by definition (is the norm)

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