Now showing items 1-3 of 3

    • A note on a common fixed point theorem of b. fisher 

      The subject of this note is to establish a common fixed point theorem in complete metric spaces which improves a well known result of B. Fisher (see [1]). Our theorem solves also the problem posed in [2].
      Universidad Nacional de Colombia Revistas electrónicas UN Boletín de Matemáticas. 2001
    • General solutions of some functional equations 

      In this paper, we determine the general solutions of the functional equation f(ux + (L − 1)vy, xv + yu + (L − 2)yv) = g(x, y) h(u, v), where f, g, h : K2 --- and gt; K are unknown functions and L in K* := K \ {0}, where K ...
      Universidad Nacional de Colombia Revistas electrónicas UN Boletín de Matemáticas. 2005
    • On a fixed point theorem by totik 

      In this paper we prove a common fixed point theorem (see Theorem 3.1) in metric spaces for two self-mappings satisfying a general implicit relation involving the diameter of nite sets, without requiring continuity. This ...
      Universidad Nacional de Colombia Revistas electrónicas UN Boletín de Matemáticas. 2009