An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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open set
  هنگردِ باز  
hangard-e bâz
Fr.: ensemble ouvert  

A → set consisting of points having → neighborhoods wholly contained in the set, as the set of points within a circle.

See also: → open; → set.