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  1. Mar 1st, 2009, 09:07 PM #1
    Arrow_Raider
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    Resolved [Resolved] Set theory proof

    My friend has a basic set theory proof problem that I tried to help him with but was unable to figure out what to do.

    (Using element argument)
    Prove that
    If Complement(A) ⊆ B Then A ∪ B = Universal set

    I have tried a direct proof, contrapositive, and contradiction but I have failed at each one. How would this be proved?

    This is NOT a homework problem of mine.
    Last edited by Arrow_Raider; Mar 1st, 2009 at 10:29 PM.
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