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... ity.

  What will be the content here?

To know.

  In the field of mathematics, the affinity number belongs to a branch of number theory.

   If you really need a number of "relatives" that can be matched with it, there are too many examples that meet the conditions.

  For example, prime numbers, equal sum numbers, isolated numbers, common sum numbers, etc.

  Even if you insist on talking.

  Non-Euclidean geometry can be related to number theory:

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