Geodesic
Solutions of the Functional Equation (f(x))2 - f(x2) = h(x)
Canadian mathematical bulletin, Tome 3 (1960) no. 2, pp. 113-120

Voir la notice de l'article provenant de la source Cambridge University Press

In a recent paper [2] Lambek and Moser have introduced the functional equations 1 and 2 in connection with some problems of number theory, in particular in dealing with the sums by pairs of sets of integers. The second may be put into the same form as (1) by the substitutions x = In z, f(ln z) = F(z), h(ln z) = H(z). 
Baker, I. N. Solutions of the Functional Equation (f(x))2 - f(x2) = h(x). Canadian mathematical bulletin, Tome 3 (1960) no. 2, pp. 113-120. doi: 10.4153/CMB-1960-012-8
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[1] 1. Baker, I. N., Zusammensetzungen ganzer Funktionen, Math. Z. 69 (1958), 121-163. Google Scholar

[2] 2. Lambek, J.andMoser, L.,On some two-way classifications of integers,Canad. Math. Bull. 2 (1959), 85-89. Google Scholar

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