Geodesic
Different addition of different quantities
Matematičeskoe obrazovanie, no. 1 (2015), pp. 53-55 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown that addition of different quantities in different mathematical or physical theories can be made in different ways.
Keywords: addition of speeds of Galileo–Newton, addition of velocities Lorentz–Einstein, speed. 
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E. N. Petrova; S. A. Pirogov. Different addition of different quantities. Matematičeskoe obrazovanie, no. 1 (2015), pp. 53-55. http://geodesic.mathdoc.fr/item/MO_2015_1_a4/

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[3] I. M. Yaglom, Kompleksnye chisla i ikh primenenie v geometrii, Fizmatgiz, M., 1963 | MR