Skip to content


  • Research Article
  • Open Access

Existence of extremal solutions for quadratic fuzzy equations

Fixed Point Theory and Applications20052005:535919

  • Received: 8 November 2004
  • Published:


Some results on the existence of solution for certain fuzzy equations are revised and extended. In this paper, we establish the existence of a solution for the fuzzy equation , where , , , and are positive fuzzy numbers satisfying certain conditions. To this purpose, we use fixed point theory, applying results such as the well-known fixed point theorem of Tarski, presenting some results regarding the existence of extremal solutions to the above equation.

Authors’ Affiliations

Departamento de Análisis Matemático, Facultad de Matemáticas, Universidad de Santiago de Compostela, Santiago de Compostela, 15782, Spain


© Nieto and Rodríguez-López 2005