Geodesic
Different addition of different quantities
Matematičeskoe obrazovanie, Tome 73 (2015) no. 1, pp. 53-55.

Voir la notice de l'article provenant de la source Math-Net.Ru

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, Tome 73 (2015) no. 1, pp. 53-55. http://geodesic.mathdoc.fr/item/MO_2015_73_1_a4/

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