Geodesic
Geodesics of a~two-dimensional pseudo-Riemannian metric and accuracy control of numerical simulations of geodesics
Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 1, pp. 205-209

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We show that the equation of nonisotropic geodesics of a two-dimensional pseudo-Riemannian metric admits substantial simplification in isotropic coordinates. 
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     author = {\`E. R. Rozendorn},
     title = {Geodesics of a~two-dimensional {pseudo-Riemannian} metric and accuracy control of numerical simulations of geodesics},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {205--209},
     publisher = {mathdoc},
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     year = {2005},
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     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_1_a8/}
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È. R. Rozendorn. Geodesics of a~two-dimensional pseudo-Riemannian metric and accuracy control of numerical simulations of geodesics. Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 1, pp. 205-209. http://geodesic.mathdoc.fr/item/FPM_2005_11_1_a8/