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9 votes
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Oscillation of monotone real-analytic function

An elementary example is given by the formula $$f(x)=\sum_{k=1}^\infty k!\,\Phi(x-k!)$$ for real $x>1$, where $\Phi$ is the standard normal cumulative distribution function. Then the function $f$ is r …
Iosif Pinelis's user avatar
1 vote
Accepted

Inferring polynomial rate of convergence from polynomial bound

The answer is no (assuming that $\|x\|:=x$ for real $x\ge0$). Indeed, as noted by mathworker21, your condition on the existence of $p$ is always satisfied, by choosing, e.g., $p(t)=c+t$ with $c:=\sup_ …
Iosif Pinelis's user avatar
2 votes

Proving a sum to be sublinear in growth

$\newcommand{\al}{\alpha} \newcommand{\de}{\delta} \newcommand{\De}{\Delta} \newcommand{\ep}{\epsilon} \newcommand{\ga}{\gamma} \newcommand{\Ga}{\Gamma} \newcommand{\la}{\lambda} \newcommand{\Si}{\Sig …
Iosif Pinelis's user avatar