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Math Help - Problem with proving

  1. #1
    Newbie Scorpy6's Avatar
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    Problem with proving

    I need to show that A is a subset of B if and only if A union B is equal to B. Can somebody help me with this? Thanks
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  2. #2
    Grand Panjandrum
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    Re: Problem with proving

    Quote Originally Posted by Scorpy6 View Post
    I need to show that A is a subset of B if and only if A union B is equal to B. Can somebody help me with this? Thanks
    You need to show two things:

    1. If A \subset B then A\cup B=B

    2. If A\cup B then A \subset B

    Now what have you tried and what problems are you having?

    CB
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