Browsing by Subject "Tangent surfac"

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    Concircular helices and concircular surfaces in Euclidean 3-space R3
    (Universidad de Hacettepe, 2023) Lucas Saorín, Pascual; Ortega Yagües, José Antonio; Matemáticas
    In this paper we characterize concircular helices in R3 by means of a differential equation involving their curvature and torsion. We find a full description of concircular surfaces in R3 as a special family of ruled surfaces, and we show that M ⊂ R3 is a proper concircular surface if and only if either M is parallel to a conical surface or M is the normal surface to a spherical curve. Finally, we characterize the concircular helices as geodesics of concircular surfaces.