I = closedInterval(P, p, q)
The closed interval between $p$ and $q$ is the subposet of $P$ induced by the elements $z$ such that $p \leq z \leq q$. If $p$ and $q$ are incomparable, then an error is thrown.
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The object closedInterval is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Posets.m2:2546:0.