The derived category of a locally compact Hausdorff space X is smooth if and only if X is discrete and finite.
Compact sheaves on a locally compact space
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abstract
We describe the compact objects in the $\infty$-category of $\mathcal C$-valued sheaves $\text{Shv} (X,\mathcal C)$ on a hypercomplete locally compact Hausdorff space $X$, for $\mathcal C$ a compactly generated stable $\infty$-category. When $X$ is a non-compact connected manifold and $\mathcal C$ is the unbounded derived category of a ring, our result recovers a result of Neeman. Furthermore, for $X$ as above and $\mathcal C$ a nontrivial compactly generated stable $\infty$-category, we show that $\text{Shv} (X,\mathcal C)$ is compactly generated if and only if $X$ is totally disconnected.
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2023 1verdicts
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The derived category of a locally compact space is rarely smooth
The derived category of a locally compact Hausdorff space X is smooth if and only if X is discrete and finite.