A Poset Hierarchy

Details A Poset Hierarchy A Poset Hierarchy

2006-08-25

arxiv.org/abs/math/0608642v1

Central European Journal of Mathematics, vol. 4, no. 2, (2006), pg. 225-241

Mathematics

Logic

Scientific paper

This article extends a paper of Abraham and Bonnet which generalised the famous Hausdorff characterisation of the class of scattered linear orders. Abraham and Bonnet gave a poset hierarchy that characterised the class of scattered posets which do not have infinite antichains (abbreviated FAC for finite antichain condition). An antichain here is taken in the sense of incomparability. We define a larger poset hierarchy than that of Abraham and Bonnet, to include a broader class of ``scattered'' posets that we call $\kappa$-scattered. These posets cannot embed any order such that for every two subsets of size $ < \kappa$, one being strictly less than the other, there is an element in between. If a linear order has this property and has size $\kappa$ we call this set $\qkappa$. Such a set only exists when $\kappa^{<\kappa}=\kappa$. Partial orders with the property that for every $a

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