
For P a poset or lattice, let Id(P) denote the poset, respectively, lattice, of upward directed downsets in P, including the empty set, and let id(P)=Id(P)-\{\emptyset\}. This note obtains various results to the effect that Id(P) is always, and id(P) often, "essentially larger" than P. In the first vein, we find that a poset P admits no "
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poset of ideals (upward directed downsets) of a poset, Mathematics - Rings and Algebras, 06A06, Rings and Algebras (math.RA), ideals generated by chains, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), math.CO, 06A06, 06A12, 06B10, Lattice of ideals of a lattice or semilattice, math.RA, 06B10, 06A12
poset of ideals (upward directed downsets) of a poset, Mathematics - Rings and Algebras, 06A06, Rings and Algebras (math.RA), ideals generated by chains, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), math.CO, 06A06, 06A12, 06B10, Lattice of ideals of a lattice or semilattice, math.RA, 06B10, 06A12
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