Note that, since ψ2(x) ∼ √x, the answers to our questions for the function ψ2 seem to
be affirmative. Such an approach, however, would only give us the required inequalities for
"large enough" (but unspecified) values of x. This would prevent us from currently using these inequalities for specified values of the variables. On the other hand, using suitable inequalities,
we will prove in Section 2 that ψ2 (2x) < ψ2 (2x) for all x, y ≥ 25. This is an example of
how inequalities with specified "starting points" will enrich the information obtained from the
asymptotic equivalences.