d = dilworthNumber P
The Dilworth number of a poset is the maximum length of an antichain.
The Dilworth number of a chain is always 1.
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The Dilworth number of the $n$ booleanLattice is $n*(n-1)/2$.
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The object dilworthNumber is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Posets.m2:5476:0.