... comparison, Fixed Point Theory 4(2003), no. 1, 15–32.[7], Stability by fixed point methods for highly nonlinear delay equations, Fixed Point Theor y5 (2004), no. 1, 3–20.[8], Fixed points and ... 38 Fixed points, stability, and harmless perturbations3. Stability by contraction mappings In all of our examples in this section we will have a function g : R → R satisfyingg(x) ... toestablish stability, as we have done in numerous earlier papers, including [6, 7, 8, 9]. In [6], we investigated the question of the relative effectiveness of fixed point theoryversus Liapunov theory...