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Wikipedia:Reference desk/Archives/Mathematics/December 2021

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Welcome to the Wikipedia Mathematics Reference Desk Archives
The page you are currently viewing is a monthly archive index. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages.



December 4

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 4

  1. What's the way to know what country is located 180 degrees from some specific city of another country?
  2. Geometric shape for four (or more) cylinders around a central cylinder

December 5

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 5

  1. Improving secrecy
  2. Density of logical valid statements

December 6

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 6

  1. Pattern in last 2 digits of polygonal numbers

December 7

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 7

  1. Lagrangian vs Eulerian specifications of a field

December 9

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 9

  1. Huge cardinal

December 12

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 12

  1. Brackets in direct products of groups
  2. The pons asinorum of logic
  3. Chance to win a chess game

December 13

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 13

  1. Ex nihilo, 1

December 15

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 15

  1. Maximum break in snooker

December 17

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 17

  1. line integral and length

December 20

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 20

  1. Approximation of the product of all primes not larger than a given prime.

December 22

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 22

  1. Rotation of a cube on its vertex
  2. The very word "primorial"
  3. Question about the Hadwiger–Nelson problem

December 25

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 25

  1. Rotating the other Platonic solids

December 27

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 27

  1. On two (supposedly solved) problems

December 30

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 30

  1. Real unit disc
  2. certain restricted permutations

December 31

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Wikipedia:Reference_desk/Archives/Mathematics/2021 December 31

  1. Number theory
  2. Sum of reciprocals
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