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Jul 7, 2023 at 11:12 comment added Vivaan Daga @BillJohnson Zorn guarantees that we can get a maximal extension to an algebra, but can we get a maximal extension to a sigma algebra?
Jan 15, 2014 at 6:14 history edited Alexander Pruss CC BY-SA 3.0
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Jan 15, 2014 at 3:51 comment added Andrés E. Caicedo Can we say more? For example, can we ensure that there is always such an extension containing the $\Sigma^1_2$ sets?
Jan 15, 2014 at 2:27 comment added Bill Johnson What am I missing? It looks obvious that Zorn's Lemma applies to give a maximal extension.
Jan 15, 2014 at 2:12 history asked Alexander Pruss CC BY-SA 3.0