An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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necessary and sufficient conditions
  بوتارهای ِ بایسته و بسنده  
butârhâ-ye bâyesté o basandé
Fr.: conditions nécessaire et suffisante  

If event A must occur for event B to occur, then it is said that A is → necessary for B. If event A may cause B but there could be some other cause as well, then it is said that A is sufficient to cause B. See also → if and only if (iff).

See also: → necessary; → and; → sufficient; → condition.