... for some functional equations in a single variable We prove the generalized Ulam-Hyers stability of the single variable equation w◦f ◦η f h 1.8 As an application of our result for 1.8 , the stability ... the stability of monomial functional equations, ” Fixed Point a Theory, vol 8, no 2, pp 201–218, 2007 25 V Radu, The fixed point alternative and the stability of functional equations, ” Fixed Point ... transformations,” Bulletin of the American Mathematical Society, vol 57, pp 223–237, 1951 Z Gajda, “On stability of additive mappings,” International Journal of Mathematics and Mathematical Sciences, vol...