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The focal developable and the binormal indicatrix of a nonlightlike curve in Minkowski 3-space. (English) Zbl 0978.53004
The paper deals with the intrinsic geometry of curves in a pseudo Euclidean 3-space (“Minkowski 3-space”, “pe-space”). Analyzing the instantaneous kinematics of the moving trihedral the authors calculate expressions for the osculating pe-circle, the (hyper)-osculating pe-sphere and the generator of the axoidal surface belonging to a not lightlike (i.e., not isotropic) curve $c$. The paper is not based on “classical” related references [e.g., {\it O. Giering}, “Vorlesungen über höhere Geometrie” (1982; Zbl 0493.51001)]. So besides some typos there occur some less usual terms as for example “focal developable” for the surface enveloped by the pe-normal planes of curve $c$, “binormal indicatrix” for the pe-spherical image of the binormals of $c$, “hyperbola and concentric pseudo sphere” for a pair of conjugate pe-spheres.

53A04Curves in Euclidean space
53B30Lorentz metrics, indefinite metrics
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