Ozturk, UfukIlarslan, KazimOzturk, Esra Betul KocNesovic, Emilija2020-06-252020-06-252018Nesovic, Emilija & Ilarslan, Kazim & Ozturk, Ufuk & Öztürk, Esra Betül. (2018). A note on Lamarle formula in Minkowski 3-space. Tamkang Journal of Mathematics. 49. 291-300.0049-29302073-9826https://doi.org/10.5556/j.tkjm.49.2018.2653https://hdl.handle.net/20.500.12587/7244Nesovic, Emilija/0000-0003-3600-0486; Ozturk, Ufuk/0000-0002-8800-7869The Lamarle formula is known as a simple relation between the Gaussian curvature and the distribution parameter of a non-developable ruled surface. In this paper, we obtain the Lamarle formula of a non-developable ruled surface with pseudo null base curve and null director vector field inMinkowski 3-space. We also obtain the corresponding striction line and distribution parameter of such surface. We prove that there is no Lamarle formula when the director vector field is spacelike and its derivative is null, because the ruled surface in that case is a lightlike plane. Finally, we give some examples.eninfo:eu-repo/semantics/openAccessPseudo-null curveruled surfaceMinkowski 3-spaceArticle49429130010.5556/j.tkjm.49.2018.26532-s2.0-85056133420Q2WOS:000449022500003N/A