Orthogonal Stability of an Additive-Quadratic Functional Equation

Abstract

Abstract Using the fixed point method and using the direct method, we prove the Hyers-Ulam stability of an orthogonally additive-quadratic functional equation in orthogonality spaces. (2010) Mathematics Subject Classification: Primary 39B55; 47H10; 39B52; 46H25.

Keywords

• Hyers-Ulam stability
• fixed point
• orthogonally additive-quadratic functional equation
• orthogonality space