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Update S77 (Michael's product topology)#1713

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yhx-12243 wants to merge 6 commits intomainfrom
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Update S77 (Michael's product topology)#1713
yhx-12243 wants to merge 6 commits intomainfrom
s77

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prabau commented Mar 29, 2026

I think this would be a good opportunity to change the name to a better one. "Michael's product topology" is not very descriptive. We could change it to "Product of Michael line and irrational numbers".
(and make the previous name an alias).

What do you think?

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prabau commented Mar 29, 2026

I have not given it any thought, but just to be thorough, why is an arbitrary product of strongly Choquet space strongly Choquet?

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prabau commented Mar 29, 2026

P61: what it the argument here? If a product $X\times Y$ is cozero complemented, why are $X$ and $Y$ the same?

Maybe it is not so trivial. I may replace it with assertion of P62, which is directly to factors.

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Just to make sure this was not prematurely approved.
@felixpernegger FYI

Co-authored-by: Felix Pernegger <s59fpern@uni-bonn.de>
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I have not given it any thought, but just to be thorough, why is an arbitrary product of strongly Choquet space strongly Choquet?

Just play each dimension indepenently, (ref: 8.16(ii) in zb:0819.04002)

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prabau commented Mar 30, 2026

Yes, I can see how that works, using basic open sets for the product topology.

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