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Math Help - Functions Injective, surjective, and/or Bijective

  1. #1
    Junior Member
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    Functions Injective, surjective, and/or Bijective

    Im just not sure how to do this.

    Heres my problem:

    Discuss whether or not the given function is injective, surjective, and/or bijective.

    f : N Q, where f(n) = 1/n
    g : X ⊆ R ⟶ R, where g(x,y,z) = e^√(x+ y+z-4)
    h : X ⊆ R ⟶ R, where h(x) = 2x/||x||₂
    Thanks
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  2. #2
    Super Member redsoxfan325's Avatar
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    The same exact question was posted on this thread.
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