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Unformatted text preview: . 1 Prove that if x n y in the poset P , then there is a linear extension L of P in which y L x . 2 Prove that every Fnite poset has a realizing set of linear extensions. 3 Compute the Mobius function for the poset P whose Hasse diagram appears below. Please express your answer as an uppertrangular matrix....
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 Spring '11
 Vetter

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