Geodesic
On Instantaneous Rectilinear Congruences
Journal for geometry and graphics, Tome 7 (2003) no. 2, pp. 129-136 Cet article a éte moissonné depuis la source Heldermann Verlag

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Two rectilinear congruences are introduced and investigated, which are generated by the instantaneous axes of revolution of the moving Darboux frame along the two families of lines of curvature on a regular non-spherical and non-developable surface.
Classification : 53A05, 53A17, 53A25
Mots-clés : Line congruence, instantaneous axis, lines of curvature 
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     author = {R. A. Abdel-Baky},
     title = {On {Instantaneous} {Rectilinear} {Congruences}},
     journal = {Journal for geometry and graphics},
     pages = {129--136},
     year = {2003},
     volume = {7},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JGG_2003_7_2_JGG_2003_7_2_a0/}
}
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R. A. Abdel-Baky. On Instantaneous Rectilinear Congruences. Journal for geometry and graphics, Tome 7 (2003) no. 2, pp. 129-136. http://geodesic.mathdoc.fr/item/JGG_2003_7_2_JGG_2003_7_2_a0/