In this paper, we investigate po-purity using finitely presented S-posets, and give some equivalent conditions under which an S-poset is absolutely po-pure. We also introduce strongly finitely presented S-posets to characterize absolutely pure S-posets. Similar to the acts, every finitely presented cyclic S-posets is isomorphic to a factor S-poset of a pomonoid S by a finitely generated right con...

Herein we report a case of primary leiomyosarcoma of testis, which was believed to originate from normal testicular structures.  It contained smooth muscle cells, blood vessels and contractile cells of the seminiferous tubules.  No evidence of tumor spread was found.Treatment consisted of orchiectomy with high ligation of the spermatic cord.  The patient received no adjuvant therapy and there w...

the aim of this paper is to analyze the undamped second order descriptor systems to show the possibility of transform an undamped second order descriptor system to a pure first order descriptor system ,on different ways, while stating some of its benefits. meanwhile we will introduce pure first order systems and undamped second order systems and indicate that under some assumptions every undamp...