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Published online by Cambridge University Press: 20 November 2018
Let f(x) be a real analytic function of the real variable x and α a simple root of the equation f(x) = 0. It is well known that a function ϕ(x) can be associated with the equation in many different ways such that
(i) α is a root of the equation ϕ(x), i.e. α is a fixed point (invariant point) of the function ϕ(x);
(ii)