On incidence algebras description of cobweb posets
  The explicite formulas for Mobius function and some other important elements of the incidence algebra of an arbitrary cobweb poset are delivered. For that to do one uses Kwasniewski's construction of his cobweb posets . The digraph representation of these cobweb posets constitutes a newly discovered class of orderable DAG's named here down KoDAGs with a kind of universality now being investigated. Namely cobweb posets' and thus KoDAGs's defining di-bicliques are links of any complete relations' chains. 
Ewa Krot-Sieniawska