Raad Aziz  Hussain Al-Abdulla, Fadhel  Attala Shneef, 
    On the Lindel of Spaces by Using coc-r-Open Sets,
    Journal of Engineering and Applied Sciences,
    Volume 13,Issue 24,
    2018,
    Pages 10203-10212,
    ISSN 1816-949x,
    jeasci.2018.10203.10212,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2018.10203.10212)
    Abstract: The purpose of this research is to extend and study types of topological spaces as Lindelof spaces
by using coc-r-open sets. In this study, we study and introduce the concepts of coc-r-open sets. A special
intrest types of spaces called coc-r-Lindelof and I-coc-r-Lindelof are studied and obtain some of their basic
properties.We introduce new types of functions using coc-r-open sets. Moreover, the relation between
Lindelof, I-Lindelof, coc-r-Lindelof and I-coc-r-Lindelof spaces are studied and investigated the topological
properties of them using coc-r-open sets.
    Keywords: coc-r-$-open and coc-r-regular;coc-r-open;open sets;l-coc-r-Lindelof;coc-r-extremally
disconnected;coc-r-Lindelof and I-coc-r-Lindelof spaces