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Date: 15-8-2021
1953
Date: 1-7-2017
1255
Date: 24-6-2017
1846
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An -dimensional open ball of radius is the collection of points of distance less than from a fixed point in Euclidean -space. Explicitly, the open ball with center and radius is defined by
The open ball for is called an open interval, and the term open disk is sometimes used for and sometimes as a synonym for open ball.
REFERENCES:
Croft, H. T.; Falconer, K. J.; and Guy, R. K. Unsolved Problems in Geometry. New York: Springer-Verlag, p. 1, 1991.
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مخاطر عدم علاج ارتفاع ضغط الدم
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اختراق جديد في علاج سرطان البروستات العدواني
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مدرسة دار العلم.. صرح علميّ متميز في كربلاء لنشر علوم أهل البيت (عليهم السلام)
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