Let P D .X; / be a poset. Suppose there are chains C1 and C2 in P such that X D C1 [ C2
Chapter 0, Problem 3(choose chapter or problem)
Let P D .X; / be a poset. Suppose there are chains C1 and C2 in P such that X D C1 [ C2. Prove that the width of P is at most 2.
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