Geodesic
Über die Funktionalungleichung f(x +y) + f(xy) ... f(x) + f(y) + f(x)f(y).
Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 297-299.

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Mots-clés : differentiable solution, functional inequality 
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     author = {Claus Hammer},
     title = {\"Uber die {Funktionalungleichung} f(x +y) + f(xy) ... f(x) + f(y) + f(x)f(y).},
     journal = {Aequationes mathematicae},
     pages = {297--299},
     publisher = {mathdoc},
     volume = {45},
     number = {2-3},
     year = {1993},
     zbl = {0788.39007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137530/}
}
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Claus Hammer. Über die Funktionalungleichung f(x +y) + f(xy) ... f(x) + f(y) + f(x)f(y).. Aequationes mathematicae, Tome 45 (1993) no. 2-3, pp. 297-299. http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137530/