Partially ordered sets and semi-simplicial complexes
Sigeru OKAMOTO · Proceedings of the Japan Academy Series A Mathematical Sciences · 1967
Comm. by Kinjir Kusc, ..., Nov. 13, 1967) 1. Introduction.Let / be the category of partially ordered sets and isotone maps, and q the one of s.s.(semi-simplicial) complexes and s.s.maps.Then, a covariant functor L: /--*q is defined naturally as