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Let $ces_0:=\{\xi\in\ell^\infty : \lim_{n\to \infty}\frac{1}{n}\sum_{k=1}^{n}\xi_k=0\}$ and $q:\ell^\infty \to \ell^\infty/ces_0$ be the usual quotient map. The space $ces_0$ is closed in $\ell^\infty$, but is not an order ideal with respect to the standard order in $\ell^\infty$. Therefore the ...
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May15
May '1918
May21
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