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    • On a problem of krasnosel'skii and rutickii 

      Bárcenas, Diomedes; Finol, Carlos
      In \cite[p. 30]{5}, 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 $f(ts)\leq f(t)f(s)$, $s,t\geq 1$. Is there another $N$-function ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.