
Let X be a finite set. This paper describes some topological and combinatorial properties of the poset ��_X of order relations on X. In particular, the homotopy type of all the intervals in ��_X is precisely determined, and the M��bius function of ��_X is computed.
FOS: Mathematics, Mathematics - Combinatorics, Algebraic Topology (math.AT), Mathematics - Algebraic Topology, Combinatorics (math.CO), Group Theory (math.GR), Mathematics - Group Theory
FOS: Mathematics, Mathematics - Combinatorics, Algebraic Topology (math.AT), Mathematics - Algebraic Topology, Combinatorics (math.CO), Group Theory (math.GR), Mathematics - Group Theory
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