Prinjective Ringel-Hall algebras for posets of finite prinjective type

In the present paper we investigate prinjective Ringel-Hall algebras, for prinjective modules over incidence algebras of posets of finite prinjective type. Results we obtain are analogous to these, given by C. M. Ringel, for representations of Dynkin quivers. In particular we give a description of prinjective Ringel-Hall algebras by generators and relations.