The iterates $h_0,h_1,h_2,\dotsc$ constructed in [6] and converging to the (only) solution $g=h\colon[0,1]\to[0,1]$ of the iterative differential equation $-\gamma g'= g^{-1}$, $\gamma>0$, are parametrised by polynomials over $\Bbb Q$, and the corresponding constant $\gamma=\kappa\approx0.278877$ is estimated by rational numbers.

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