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Math Help - Least Upper Bound

  1. #1
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    Least Upper Bound

    Consider the Hasse diagram shown below. What is the least upper bound for the subset {c, d, e}?

    The upper bounds for {c, d, e} are f, g, h. But what is the least upper bound? My friend says the least upper bound does not exist. I say the least upper bound is h because it is related to f and g.

    Which one of us is right?
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  2. #2
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    You are correct.
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