Sahin, B2024-08-042024-08-0420020019-5588https://hdl.handle.net/11616/93539This study introduces QR-lightlike submanifold of an indefinite quaternion Kaehler manifold and investigates its some fundamental properties. Necessary and sufficient conditions have been also given for QR-lightlike submanifold to be a mixed totally geodesic and, D-totally geodesic after investigating the integrability of distributions defined on QR-lightlike submanifolds. Further, totally umbilical QR-lightlike submanifolds are studied and some theorems are given.eninfo:eu-repo/semantics/closedAccessindefinite quaternion Kaehler manifoldslightlike submanifoldQR-lightlike submanifoldnull sectional curvaturetotally umbilical lightlike submanifoldArticle3311168517062-s2.0-0037899608Q3WOS:000180586500008Q4