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Ring homomorphisms equation revisited
(2000)
The functional equation
f(x + y) + f(xy) = f{x) + f(y) + f(x)f(y) (*)
has been studied by J. Dhombres (Relations de dépendance entre les équations fonctionnelles de Cauchy, Aequationes Math. 35
(1988), 186- 212) for ...