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

1 vote

Is there a natural measurable structure on the $\sigma$-algebra of a measurable space?

$\newcommand\sdiff{\mathbin\triangle}$Starting from literally just the measurable space $(X,\Sigma)$, I wouldn't think there's any particularly nice and natural $\sigma$-algebra on $\Sigma$; but with …
Julian Newman's user avatar