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Date: 3-6-2021
1875
Date: 8-8-2021
1270
Date: 15-8-2021
1918
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The connected sum of -manifolds and is formed by deleting the interiors of -balls in and attaching the resulting punctured manifolds to each other by a homeomorphism , so
is required to be interior to and bicollared in to ensure that the connected sum is a manifold.
Topologically, if and are pathwise-connected, then the connected sum is independent of the choice of locations on and where the connection is glued.
The illustrations above show the connected sums of two tori (top figure) and of two pairs of multi-handled tori.
The connected sum of two knots is called a knot sum.
REFERENCES:
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 39, 1976.
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تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
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أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
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خدمات متعددة يقدمها قسم الشؤون الخدمية للزائرين
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