M = maximalAntichains P
A set of elements of $P$ is called an antichain if no two distinct elements of the set are comparable. An antichain is maximal if it is not properly contained in any other antichain of $P$.
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The object maximalAntichains is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Posets.m2:4875:0.