Characterizations of null curves in 4-dimensional minkowski spacetime

This thesis consist of five chapters. The first chapter has been devoted to the introduction. In the second chapter; fundamental definitions of semi-Euclidean space R₂⁴, Bertrand curves, Helices and Inextensible Flows have been given. In the third chapter; Bertrand curves of Partially Null ve Pseudo Null curves have been studied in semi-Euclidean space R₂⁴. In the fourth chapter; A characterization related to General Helices has been given. In the fifth chapter; Notion of Inextensible Flow was defined and The characterizations related to Inextensible Flows of Partially Null and Pseudo Null curves have been attained. Keywords: Bertrand Curve, (1,3) Bertrand curve, (2,3) Bertrand curve, Flow, Inextensible Flow.