Sasikala, DDeepa, M2024-11-132024-11-132019-110886-9367https://app.box.com/s/ca853bqzai108mh0ynqohun25k0dczerThe main aim of this paper is to present a new set, namely quad j-open set in quad topological space. We discuss the basic properties of quad j-open sets using quad j-interior and quad j-closure. In Addition we study the relationships among quad j-closed, quad b- closed and quad j-regular open in quad topological space.en-USquad j-open,quad j-closedquad pre closurequad regular openArticle