An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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proper subset
  زیرهنگرد ِ سره  
zirhangard-e saré
Fr.: sous-ensemble propre  

Of two sets A and B, the set A if it is contained in B (A ⊂ B) but is not equal to B (A ≠ B).

See also: → proper; → subset.