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What Does f : ℕ → ℕ mean?

  1. Oct 19, 2013 #1
    1. The problem statement, all variables and given/known data

    It is in some notes that I found online in an attempt to understand something else that I need to know for a math course.

    2. Relevant equations

    f : ℕ → ℕ

    3. The attempt at a solution

    It seems to mean that a function of some natural number will equal some other natural number such as n^2 where n is an element of the naturals. But I am not sure.
  2. jcsd
  3. Oct 19, 2013 #2


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    Yes, it means f is a function that maps the natural numbers into the natural numbers. f(n)=n^2 is a fine example.
  4. Oct 19, 2013 #3
    Thank-you, that is a relief.
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