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Homework Help: Discrete Math Function problem

  1. Sep 23, 2005 #1
    Hey if anyone could help me with this I would be sooo grateful. Im trying to grasp the idea of onto, one-to-one and bijection(both) functions.

    A sample problem is: If f(x) = 2x . What is f(Z), all integers. What is f(N), all naturals. What is f(R), all real. These are 3 different problems, and im trying to figure out if they are onto, and/or one-to-one or bijection(which means both).

    Any help would be a BIG HELP! Thanks!
  2. jcsd
  3. Sep 24, 2005 #2

    anyone? Thanks
  4. Sep 24, 2005 #3
    ......... =/
  5. Sep 24, 2005 #4
    What is it you don't understand about one-to-one and onto functions?
  6. Sep 24, 2005 #5
    Yeah, definitions are always the most important thing here. Type them up here and think about them for a bit and then we'll see what you're having trouble with.
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