University of MaraghehSahand Communications in Mathematical Analysis2322-580710120180401Products Of EP Operators On Hilbert C*-Modules61712840210.22130/scma.2017.28402ENJavadFarokhi-OstadDepartment of Mathematics, Faculty of Mathematics and Statistics, University of Birjand, Birjand, Iran.0000-0000-0000-0000Ali RezaJanfadaDepartment of Mathematics, Faculty of Mathematics and Statistics, University of Birjand, Birjand, Iran.Journal Article20161013In this paper, the special attention is given to the product of two modular operators, and when at least one of them is EP, some interesting results is made, so the equivalent conditions are presented that imply the product of operators is EP. Also, some conditions are provided, for which the reverse order law is hold. Furthermore, it is proved that $P(RPQ)$ is idempotent, if $RPQ$<sup>†</sup> has closed range, for orthogonal projections $P,Q$ and $R$.https://scma.maragheh.ac.ir/article_28402_1be457bb812e3fe49f49618ae3136280.pdf