
Zermelo–Fraenkel set theory
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Search complete. 3 mentions across 1 episode found for "Zermelo–Fraenkel set theory".
Sep 16, 2026
aboutlogic: premises #08 | Choice vs. Excluded Middle: A Constructive Paradox
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4:53Thorsten AltenkirchHOST
Yes
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4:53Deniz SarikayaHOST
... given the rest of the ZF axioms.
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4:55Deniz SarikayaHOST
And I, I think, I mean, there is a lot of convincing and cheating there involved.
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5:01Deniz SarikayaHOST
Um, if, if I think about this version, the infinite product of non-empty sets is, uh, non-empty, this sounds so obvious.
25 MINS LATER
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29:43Thorsten AltenkirchHOST
Whereas the other way, choice does imply excluded middle.
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29:47Thorsten AltenkirchHOST
So, so an, an axiom of choice is, is the, the stronger brutalist version of, uh, of classical logic.
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29:56Deniz SarikayaHOST
Maybe one final remark, I think from my side, would be that classically speaking, choice is rather tame because it doesn't change the consistency threa-strength of ZF.
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30:08Thorsten AltenkirchHOST
Yeah.