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Enriched categories, topoi, abelian categories, monoidal categories, homological algebra.

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A structure on the groupoid of algebraic closures

Given a field $k$ let $\Omega(k)$ be the set of algebraic closures of $k$. $\Omega(k)$ is obviously a groupoid. At each element $\bar{k}$ of $\Omega(k)$ we have its automorphism group over $k$, whic …
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