Geodesic
On Instantaneous Rectilinear Congruences
Journal for geometry and graphics, Tome 7 (2003) no. 2, pp. 129-136.

Voir la notice de l'article provenant de la source Heldermann Verlag

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},
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     number = {2},
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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/