ORTHOGONALLY ADDITIVE AND ORTHOGONALLY QUADRATIC FUNCTIONAL EQUATION

Jung Rye Lee, Sung Jin Lee, Choonkil Park
2013 Korean Journal of Mathematics  
Using the fixed point method, we prove the Ulam-Hyers
doi:10.11568/kjm.2013.21.1.1 fatcat:pm4xydowzvfa7khdxllovt342q