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The theory of lattices in the sense of order theory. For the number-theoretic notion, use the tag "lattices" instead.

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How should the proof of the XYZ theorem be understood?

The XYZ Theorem of Shepp [1] states the following for a given poset $P$. Consider the probability space of all the linear extensions of $P$, where each possible extension is equally likely. Then for a …
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