Geodesic
The gravity first (on reincarnation of third Kepler's law)
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2019), pp. 15-27 Cet article a éte moissonné depuis la source Math-Net.Ru

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About four senturies ago considering flat sections of cone $x^2+y^2=z^2$ (along the axis of rotation on plane $Oxy$), Robert Hooke wrote one of fundamental differential equations $(x,y,z)^{\prime\prime}=-\frac{4 \pi^2k}{(\sqrt{x^2+y^2+z^2})^3}\cdot(x,y,z)$, which thereafter set the foundation of the law of universal gravitation and explanation of movement of charged particle in classical stationary Coulomb field. In the present work differential-algebraic models, arising as the result of replacement of cone with an arbitrary quadric surface $F(x,y,z)=0$ with respect to (called by us) Kepler parametrization of quadratic curves $\{F(x,y,\alpha\cdot x+\beta\cdot y+\delta)=0\:|\:\alpha,\beta,\delta\in K\},\:K=\mathbb{R},\mathbb{C}$, are proposed and studied. 
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     title = {The gravity first (on reincarnation of third {Kepler's} law)},
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O. V. Gerasimova; Yu. P. Razmyslov. The gravity first (on reincarnation of third Kepler's law). Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2019), pp. 15-27. http://geodesic.mathdoc.fr/item/VMUMM_2019_4_a2/

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