Geodesic
Lagrange's problem on mean motion
Algebra i analiz, Tome 20 (2008) no. 2, pp. 218-225.

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

The famous mean motion problem, dating back to Lagrange, is about the existence of the average speed for the amplitude of any exponential polynomial with exponents on the imaginary axis, whenever the variable moves along a horizontal line. This problem was completely solved by B. Jessen and H. Tornehave in Acta Math. 77, 1945. Here, we give a simple version of that proof.
Keywords: Mean motion, exponential polynomial, Lagrange's conjecture, Weierstrass preparation theorem. 
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S. Yu. Favorov. Lagrange's problem on mean motion. Algebra i analiz, Tome 20 (2008) no. 2, pp. 218-225. http://geodesic.mathdoc.fr/item/AA_2008_20_2_a7/

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