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Date: 10-6-2021
1616
Date: 28-7-2021
1618
Date: 19-6-2021
1635
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If the knot is the boundary of a singular disk which has the property that each self-intersecting component is an arc for which consists of two arcs in , one of which is interior, then is said to be a ribbon knot.
Every ribbon knot is a slice knot, and it is conjectured that every slice knot is a ribbon knot.
Knot , illustrated above, is a ribbon knot (Rolfsen 1976, p. 225).
REFERENCES:
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 225, 1976.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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المجمع العلمي ينظّم ندوة حوارية حول مفهوم العولمة الرقمية في بابل
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