00578nam a2200133Ia 4500008004100000082001900041100005300060245014100113260005000254300002900304490006100333700002400394700002600418260317b        |||||||| |||| 00| 0 eng d  a510.3bEn56.31  aEncyclopedia of Mathematics and its applications  aFunctional equations in several variables with applications to mathematics, information theory and to the natural and social sciencesb/  aCambridge:bCambridge University Press,c1989  axiii, 462p. Index, Bibl.  aEncyclopedia of Mathematics and its applicationsv V. 31  aAczel, J. eauthor.  aDhombres, J.eauthor.