m = posetMeet(P, a, b)
The meet of $a$ and $b$ in $P$, if it exists, is the unique greatest element less than both $a$ and $b$.
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The object posetMeet is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Posets.m2:4541:0.