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    Helix Surfaces in Euclidean 3-Space with Density
    (Osman SAĞDIÇ, 2021) Kazan, Ahmet; Kazan, Sema
    The differential geometry of helix curves and helix hypersurfaces in different spaces has important application areas in many disciplines. Also, the notion of weighted manifold is become to be a very popular topic for scientists in recent years. In this context, after defining the notions of weighted mean curvature (or...-mean curvature) and weighted Gaussian curvature (or ...-Gaussian curvature) of an n-dimensional hypersurface on manifolds with density, lots of studies have been done by differential geometers in different spaces with different densities. So, in the present study, firstly we give the normal vector field, mean curvature and Gaussian curvature of a helix surface in three dimensional Euclidean space and after that, we obtain the weighted mean curvature and weighted Gaussian curvature of a helix surface generated by a unit speed planar curve in three dimensional Euclidean space with different three densities by stating the parametric equation of this surface. However, we know that a hypersurface is weighted minimal and weighted flat in Eucilidean 3-space with density if the weighted mean curvature and the weighted Gaussian curvature vanish, respectively. So, by using these definitions, we obtain the weighted minimal helix surfaces for these different densities and give some results for weighted flatness of the helix surfaces in Euclidean 3-space. We hope that, this study will bring a new viewpoint to differential geometers who are dealing with constant angle surfaces and in near future, one can handle these surfaces in different spaces with another densities.
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    k-TYPE SLANT HELICES DUE TO GENERALIZED BISHOP FRAME (GBF) OF TYPE C AND TYPE D IN E4
    (Palestine Polytechnic University, 2025) Singh, Charan; Kazan, Ahmet; Altın, Mustafa; Kazan, Sema; Jamali, Mohammed
    The present article deals with the study of k-type slant helices with two equivalence classes of generalized Bishop frames (GBF) called type C frame and type D frame in E4 and obtain characterizations for such curves with these frames. © Palestine Polytechnic University-PPU 2025.
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    ON CERTAIN SPACE CURVES DUE TO PARALLEL TRANSPORT FRAME IN En
    (Univ Nis, 2025) Singh, Charan; Kazan, Ahmet; Altin, Mustafa; Kazan, Sema; Jamali, Mohammed
    In this paper, we study k-type (k is an element of {0, 1, 2, ...., n-1}) slant helices due to non-zero parallel transport frame in E-n. We give some characterizations for 0-type, 1-type,..., and in general (n-1)-type slant helix due to parallel transport frame in terms of parallel transport curvatures in E-n and with the aid of these characterizations we give an important general theorem which gives the necessary and sufficient condition for any space curve to be k-type slant helices due to parallel transport frame in E-n. We also obtain the characterizations of the curves whose position vectors belong to the normal, rectifying and osculating spaces (called normal, rectifying and osculating curves, respectively) due to parallel transport frame in E-n.