@article{MAKHILLJEAS2018132417244, title = {On the Lindel of Spaces by Using coc-r-Open Sets}, journal = {Journal of Engineering and Applied Sciences}, volume = {13}, number = {24}, pages = {10203-10212}, year = {2018}, issn = {1816-949x}, doi = {jeasci.2018.10203.10212}, url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2018.10203.10212}, author = {Raad Aziz and}, 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}, 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.} }