Graph isomorphisms of modular multilattices
Graph isomorphisms of partially ordered sets
Hales-Jewett's theorem without short cycles
Hausdorff ’s theorem for posets that satisfy the finite antichain property
Hausdorff characterized the class of scattered linear orderings as the least family of linear orderings that includes the ordinals and is closed under ordinal summations and inversions. We formulate and prove a corresponding characterization of the class of scattered partial orderings that satisfy the finite antichain condition (FAC). Consider the least class of partial orderings containing the class of well-founded orderings that satisfy the FAC and is closed under the following operations: (1)...
Ideal extensions of ordered sets.
Ideals in distributive posets
We prove that any ideal in a distributive (relative to a certain completion) poset is an intersection of prime ideals. Besides that, we give a characterization of n-normal meet semilattices with zero, thus generalizing a known result for lattices with zero.
Ideals of weakly associative lattices and pseudo-ordered sets
Indexed annihilators in ordered sets
Inevitability in diamond processes
Infimum and supremum completeness properties of ordered sets without axioms.
Invariant semigroups of othodox semigroups.
Irreducible elements of posets
Kombinatorik auf geordneten Mengen.
La struttura delle relazioni «molto maggiore» e «molto minore» nel calcolo approssimato
Lattice betweenness relation and a generalization of König's lemma
Lattices freely generated by partially ordered sets: which can be "drawn"?
Lattices in quasiordered sets
Lattices of convex equivalences
Lattices of generating systems
Lattices of quasiorders on universal algebras