I = orderIdeal(P, L)
The order ideal of a given set of elements of a poset is all the elements in the poset which are less than or equal to at least one of the elements in the given set.
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The object orderIdeal is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Posets.m2:2877:0.