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Math Help - lower bound

  1. #1
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    lower bound

    let A be a subset of R
    prove that x is a lower bound of A if and only if -x is a lower bound of -A
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  2. #2
    MHF Contributor

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    This is your third post in a row about basically the same thing. Have you tried anything? What does "x is a lower bound of A" mean? If a is a member of A, what equation or inequality can you write?
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