Filomat 2022 Volume 36, Issue 6, Pages: 2051-2062
https://doi.org/10.2298/FIL2206051N
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On non-null relatively normal-slant helices in Minkowski 3-space
Nešović Emilija (Department of Mathematics and Informatics, Faculty of Science, University of Kragujevac, Kragujevac, Serbia), nesovickg@sbb.rs
Öztürk Ufuk (Department Mathematics, Faculty of Science, University of Çankırı Karatekin, Çnkırı, Turkey), ozturkufuk06@gmail.com, uuzturk@asu.edu
Koç Öztürk Esra Betül (Department of Mathematics, Faculty of Arts and Sciences, Bolu Abant İzzet Baysal University, Bolu, Turkey), e.betul.e@gmail.com, ekocoztu@asu.edu
By using the Darboux frame |ξ, ζ, η| of a non-null curve lying on a
timelike surface in Minkowski 3-space, where ξ is the unit tangent vector of
the curve, η is the unit spacelike normal vector field restricted to the
curve and ζ = ±η × ξ, we define relatively normal-slant helices as the
curves satisfying the condition that the scalar product of the fixed vector
spanning their axis and the non-constant vector field ζ is constant. We give
the necessary and sufficient conditions for non-null curves lying on a
timelike surface to be relatively normal-slant helices. We consider the
special cases when non-null relatively-normal slant helices are geodesic
curves, asymptotic curves, or lines of the principal curvature. We show that
an asymptotic spacelike hyperbolic helix lying on the principal normal
surface over the helix and a geodesic spacelike general helix lying on the
timelike cylindrical ruled surface, are some examples of non-null relatively
normal-slant helices in E31.
Keywords: Slant helix, general helix, Darboux frame, timelike surface, Minkowski space
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