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Date: 27-6-2021
1148
Date: 26-5-2021
1396
Date: 28-6-2021
1484
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Let be a group, then there exists a piecewise linear knot in for with iff satisfies
1. is finitely presentable,
2. The Abelianization of is infinite cyclic,
3. The normal closure of some single element is all of ,
4. ; the second homology of the group is trivial.
REFERENCES:
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, pp. 350-351, 1976.
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علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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قصة أصحاب السبت
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