%0 Journal Article
%T On a Problem of Krasnosel'skii and Rutickii
%A B¨¢RCENAS
%A DIOMEDES
%A FINOL
%A CARLOS
%J Revista Colombiana de Matem¨¢ticas
%D 2011
%I Universidad Nacional de Colombia and Sociedad Colombiana de Matem¨¢ticas
%X in [5,p. 30], m. a. krasnosel'skii and ya. b. rutickii proposed a problem, which can be reformulated as follows. let f be an n-function such that f(ts)¡Ü f(t)f(s), s,t¡Ý 1. is there another n-function f such that f(st)¡Ü f(t)f(s), s,t>0 and equivalent to f on [1,¡Þ)?. we give a necessary and sufficient condition for a positive and constructive solution.
%K orlicz functions
%K n-functions
%K submultiplicative functions
%K matuszewska--orlicz indices.
%U http://www.scielo.org.co/scielo.php?script=sci_abstract&pid=S0034-74262011000200006&lng=en&nrm=iso&tlng=en