The poset P is a lower semilattice if every pair of vertices has a unique greatest lower bound (meet).
i1 : n = 4; |
i2 : isLowerSemilattice chain n o2 = true |
i3 : B = booleanLattice n; |
i4 : isLowerSemilattice B o4 = true |
i5 : isLowerSemilattice flagPoset(B, {1,2,3}) o5 = false |
i6 : B' = flagPoset(B, {0,1,2,3}); |
i7 : isLattice B' o7 = false |
i8 : isLowerSemilattice B' o8 = true |