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Countable quantities refer to items or amounts that can be counted individually, typically as discrete units. In mathematics and set theory, a countable set is one that can be put into a one-to-one correspondence with the natural numbers, meaning you can enumerate the elements of the set, even if there are infinitely many of them. For example: - The set of natural numbers (1, 2, 3, ...) is countable.

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  1. Integers
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
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