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    if f: Z+ > A and g: Z+ > B
    how do you show that you can combine them to get h: Z+ > AUB?
    Given that f and g are bijections?

    Very stuck :/
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    Hint: can you find two copies of Z+ inside Z+?
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    (Original post by around)
    Hint: can you find two copies of Z+ inside Z+?
    Two copies?
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    (Original post by EllieLC)
    Two copies?
    Well, if you could find two copies of Z+ inside Z+, you could map one to A using f, and one to B using g.

    So Z+ = {0, 1, 2, 3, ...}. Can you divide this set into two?
 
 
 
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