... “On the stability of the linear functional equation,” Proceedings of the National Academy of Sciences of the United States of America, vol 27, no 4, pp 222–224, 1941 T Aoki, “On the stability of ... “Solution of a problem of Ulam,” Journal of Approximation Theory, vol 57, no 3, pp 268–273, 1989 23 L C˘ dariu and V Radu, Fixed points and the stability of Jensen’s functional equation,” Journal of ... which implies the inequality d f, H ≤ L , − 2L 2.37 which implies that the inequality 2.30 holds The rest of the proof is similar to the proof of Theorem 2.1 Corollary 2.4 Let r > and θ be nonnegative...