The poset of posets
classification
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omegaposetcombinatorialcomputeddescribesdeterminedfinitefunction
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Let X be a finite set. This paper describes some topological and combinatorial properties of the poset \Omega_X of order relations on X. In particular, the homotopy type of all the intervals in \Omega_X is precisely determined, and the M\"obius function of \Omega_X is computed.
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