【摘要】 在中心左S 系中 ,引入了伪投射系的概念 ,并研究了其性质 ,刻画了所有左S 系是伪投射系的幺半群、所有伪投射系是投射系的幺半群 .更多还原

【Abstract】 The pseudo projective act is drawn into central left S act.It is depicted that every left S act is a monid of pseudo projective act,as well as every pseudo projective act is a monoid of projective act.更多还原