I = principalOrderIdeal(P, a)
The order ideal of a element of a poset is all the elements in the poset which are less than or equal to the given element.
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The object principalOrderIdeal is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Posets.m2:2935:0.