In $L^p(\mathbb R)$ or $\ell^p$ for $1 \le p \le \infty$,, $\{f: |f(x)| \le |x| \}$.
Robert Israel
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In $L^p(\mathbb R)$ or $\ell^p$ for $1 \le p \le \infty$,, $\{f: |f(x)| \le |x| \}$.