necessary condition

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Earlier we drew a distinction between causally necessary and sufficient conditions and lawfully necessary and sufficient conditions.
Thus, the event structure may be reduced to the single necessary and sufficient condition of full Soviet support for a regime of this type to ensure its perpetuation.
(Owens dispenses with the common-sense idea that coincidences have to be out-of-the-ordinary.) The notion of 'Causal factors' is then independently analysed in terms of necessary and sufficient conditions (plus laws of nature).