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Date: 30-5-2021
1957
Date: 4-7-2017
1603
Date: 28-7-2021
1539
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A one-sided surface reminiscent of the Möbius strip, attributed to Gourmalin (Bouvier and George 1979, p. 477; Boas 1995). This surface is topologically equivalent to a Klein bottle with a hole in it, and is topologically distinct from the Möbius Strip (Gramain 1984, Stewart 2000b).
REFERENCES:
Boas, R. P. Jr. "Möbius Shorts." Math. Mag. 68, 127, 1995.
Bouvier, A. and George, M. Dictionaire des mathématiques. Paris: Presses Universitaires de France, 1979.
Gramain, A. Topology of Surfaces. Moscow, ID: BCS Associates, 1984.
Stewart, I. "Mathematical Recreations: Reader Feedback." Sci. Amer. 282, 111, May 2000a.
Stewart, I. "Mathematical Recreations: Reader Feedback." Sci. Amer. 283, 101, Sep. 2000b.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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العتبة العباسية تستعدّ لتكريم عددٍ من الطالبات المرتديات للعباءة الزينبية في جامعات كركوك
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