Regularity and Normality via Ideals

In this paper, the concepts of I-regular, I-normal and completely I-normal spaces have been presented utilizing the I-open notion. Moreover, , T I − -spaces, 5 , 4 , 3 = i are also given. The similarities and dissimilarities between them and some other known corresponding types are discussed. Also, some of their characterizations and several of fundamental properties have been established.