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Comments for The Everything Seminar
https://cornellmath.wordpress.com
Geometry, Topology, Categories, Groups, Physics, . . . EverythingTue, 11 Nov 2025 01:56:12 +0000
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Comment on Tips for Comments by Sơn Đinh Phan
https://cornellmath.wordpress.com/tips-for-comments/#comment-72663
Tue, 11 Nov 2025 01:56:12 +0000https://cornellmath.wordpress.com/?page_id=226#comment-72663I really like your post, and I would be very happy if you could visit my website https://lambanghieubmt.com/lam-bang-hieu-dak-lak/
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Comment on What killed Madame Curie? (Part 1) by Anonymous
https://cornellmath.wordpress.com/2009/05/21/what-killed-madame-curie-part-1/#comment-72661
Tue, 04 Nov 2025 23:57:08 +0000https://cornellmath.wordpress.com/?p=715#comment-72661I learned the name first time when I was studying in class six. The picture of Madame Curi attracted me in the science laboratory.. I felt by looking at the picture I am Madame cure and I have a calling for inventing to safe guard humanity with humaness .
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Comment on The Axiom of Choice is Wrong by Alpheus
https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72660
Fri, 03 Oct 2025 06:09:32 +0000https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72660I just made it to the end of this comment section, and having seen how old it is, yet how recent the last comment is, I thought it would be a shame if I didn’t say anything!
Alas, I have nothing substantial to say, except that in reading about the “pathological” results of both the Axiom of Choice and its alternatives, the controversies between them all lie in counterintuitive effects of infinity — and discussing these various alternatives is merely a discussion of what you might expect infinities could or could not do.
I suspect that none of these will fit well with physical reality one way or the other, if only because we mortal humans can’t measure in infinite precision — but I can’t rule out the possibility that some day we’ll find one physical phenomenon that fits with AoC, and another that fits with one of its negations.
I am also now wondering: is it possible to “embed” AoC into the logic system of its various negations, and vice versa? Hyperbolic and Spherical geometries can be embedded into Euclidean easily enough, and for a sufficient “zooming in”, Euclidean is a very good approximation of either geometry!
But it is late, I’m tired, and I may forget to search for such “embeddings” tomorrow … my intuition, for what it’s worth, suggests it may be possible …
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Comment on My last LHC status update by abdalrhmanretz
https://cornellmath.wordpress.com/2010/09/21/my-last-lhc-status-update/#comment-72650
Fri, 04 Apr 2025 11:37:07 +0000https://cornellmath.wordpress.com/?p=1045#comment-72650
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Comment on What killed Madame Curie? (Part 4) by Anonymous
https://cornellmath.wordpress.com/2009/09/07/what-killed-madame-curie-part-4/#comment-72649
Wed, 26 Mar 2025 10:47:01 +0000https://cornellmath.wordpress.com/?p=813#comment-72649I somehow arrived at this story while trying to find the origin of a half-remembered quote, and then spent most of the evening reading it. I don’t have a background in physics beyond basic college courses, but this was both accessible and fascinating. I’m so glad it exists!
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Comment on The Axiom of Choice is Wrong by Abby
https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72648
Fri, 14 Mar 2025 18:12:15 +0000https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72648This is awwesome
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Comment on What killed Madame Curie? (Part 1) by Anonymous
https://cornellmath.wordpress.com/2009/05/21/what-killed-madame-curie-part-1/#comment-72646
Fri, 31 Jan 2025 01:20:09 +0000https://cornellmath.wordpress.com/?p=715#comment-72646lol
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Comment on The Axiom of Choice is Wrong by Anonymous
https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72643
Thu, 28 Nov 2024 15:22:15 +0000https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72643In reply to Anonymous.
The inability to writing it down or memorizing is a weak argument, unless you are an ultrafinitist. We cannot write down any countably infinite set either.
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Comment on The Axiom of Choice is Wrong by Anonymous
https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72642
Thu, 28 Nov 2024 15:08:13 +0000https://cornellmath.wordpress.com/2007/09/13/the-axiom-of-choice-is-wrong/#comment-72642It seems to me like the use of transfinite induction is more paradoxical in this example than the axiom of choice. The set of equivalence classes can be shown to be uncountably infinite by a diagonalization argument, so memorizing them (even writing them down) seems dubious. Moreover, there is no way for a prisoner to complete their computation to determine their equivalence class. At any point while writing down the sequence of hats in front of them, they cannot be guaranteed that the sequence does not diverge beyond the finite prefix they have “seen so far”.
So there seem to be paradoxes involved even before any prisoner gets the chance to invoke the axiom of choice.
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Comment on What killed Madame Curie? (Part 1) by Anonymous
https://cornellmath.wordpress.com/2009/05/21/what-killed-madame-curie-part-1/#comment-72641
Wed, 30 Oct 2024 11:09:50 +0000https://cornellmath.wordpress.com/?p=715#comment-72641Are these true
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