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Opposite way!

  • Writer: SAIKAT MAITY
    SAIKAT MAITY
  • Mar 23, 2021
  • 1 min read

Christopher Zeeman tried for 7 years to prove that one cannot untie a knot on a 4-sphere. Then one day he decided to try to prove the opposite, and he succeeded in a few hours.

 
 
 

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