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Weierstrass functions and a generalization of the additive-multiplicative Weierstrass inequality

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Let $J$ denote the interval either $(0,1]$ or $ [1, \infty)$. A positive function $f$ on $J$ with $f(1) =1$ is reffered to as a Weierstrass function if it fulfils the double inequality for $x,y \in J$: $$f(x) + f(y) -1 \leq f(xy) \leq f(x)f(y). $$ By means of such functions we can extend the classical Weierstrass inequality (the above inequality for $f(
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