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danharaj commented on Intuitive Guide to Maxwell's Equations   github.com/photonlines/In... · Posted by u/photon_lines
OscarCunningham · 6 years ago
You can even write them in terms of the four-vector A rather than F (related by F = dA) to reduce them to ddA = J.
danharaj · 6 years ago
escape your hodge duals fam

Dead Comment

danharaj commented on New Geometric Perspective Cracks Old Problem About Rectangles   quantamagazine.org/new-ge... · Posted by u/exanimo_sai
perl4ever · 6 years ago
>welching

Did you mean whinging?

danharaj · 6 years ago
My mind was in between whinging and kvetching.
danharaj commented on New Geometric Perspective Cracks Old Problem About Rectangles   quantamagazine.org/new-ge... · Posted by u/exanimo_sai
thaumasiotes · 6 years ago
The text you quote is not even part of the article.

But it is related to text that precedes my quote:

> One of the problems the two friends looked at was a version of a century-old unsolved question in geometry.

> “The problem is so easy to state and so easy to understand, but it’s really hard,” said Elizabeth Denne of Washington and Lee University.

> It starts with a closed loop — any kind of curvy path that ends where it starts. The problem Greene and Lobb worked on predicts, basically, that every such path contains sets of four points that form the vertices of rectangles of any desired proportion.

Emphasis mine. The article explicitly describes the problem they solved, only to later point out that they actually solved a different problem.

danharaj · 6 years ago
Oh my god here, is the same qualification near the top of the article.

> One of the problems the two friends looked at was a version of a century-old unsolved question in geometry.

On every Quanta article there's always someone welching about some gotcha they think they've found that just demonstrates how trash Quanta's popularizations of mathematical topics is. But whenever I read the article in question it always turns out that the writers and editors over there somehow manage to thread the needle in making their material accessible without being mathematically inaccurate. Vague, yes, but that's why they link to the research in question because it's a pop article not a journal publication.

You edited your comment to add another objection. It is equally insubstantial unless you dug through the paper yourself and demonstrated that the transformation applied could not reasonably be called a rotation.

danharaj commented on New Geometric Perspective Cracks Old Problem About Rectangles   quantamagazine.org/new-ge... · Posted by u/exanimo_sai
thaumasiotes · 6 years ago
> It starts with a closed loop — any kind of curvy path that ends where it starts. The problem Greene and Lobb worked on predicts, basically, that every such path contains sets of four points that form the vertices of rectangles of any desired proportion.

> Their final proof — showing the predicted rectangles do indeed exist — transports the problem into an entirely new geometric setting. There, the stubborn question yields easily.

Except that the article then contradicts itself by saying how they haven't actually proved this. They proved it for smooth closed curves, not for any closed curves.

This is a really bizarre article. They seem like they want to describe the math. But they can't bring themselves to do it in a way that might be helpful. They're just waving words around.

And then there's this:

> it’s possible to rotate the Möbius strip in four-dimensional space so that you only change one of the coordinates in each point’s four-coordinate address — like changing the street numbers of all the houses on a block, but leaving the street name, city and state unchanged. (For a more geometric example, think about how holding a block in front of you and shifting it to the right only changes its x coordinates, not the y and z coordinates.)

You can certainly translate a space along an axis without affecting its coordinates along other axes. But that's not a rotation.

danharaj · 6 years ago
> While locked down due to COVID-19, Joshua Greene and Andrew Lobb figured out how to prove a version of the “rectangular peg problem.”

Emphasis mine.

danharaj commented on The Wrongful Death of Toussaint Louverture   historytoday.com/archive/... · Posted by u/Thevet
danharaj · 6 years ago
I'm currently reading The Black Jacobins which is about Toussaint L'Ouverture and the revolution in Haiti. Even after having read accounts of the brutality of slavery multiple times before, it always seems to recede into an abstraction after a long time and the descriptions are as gruesome and horrifying as they ever were. And this is a book that spares the details, relatively speaking.

The wealth of the world is covered in blood.

danharaj commented on Pseudonymity as a Trivial Concession to Genius   scottaaronson.com/blog/?p... · Posted by u/MindGods
norswap · 6 years ago
Also, it should go down. If you're going to call something vile, you should at least provide some argument to that effect.

Second, and not that it matters, but searching Scott's real name does not link him as the author of SSC, which is what Scott cares about.

Rationalists have written a lot about: - making better arguments, and discursive standards - holding truer beliefs no matter if it goes against your current beliefs or makes you appear "cringeworthy"or "pseudo-intellectual"

Maybe you really ought to check them out?

danharaj · 6 years ago
Unfortunately the rationalist community basically engages in sophistry centered around a naive and outdated positivism with Bayes' rule slapped on top.
danharaj commented on Pseudonymity as a Trivial Concession to Genius   scottaaronson.com/blog/?p... · Posted by u/MindGods
scarmig · 6 years ago
My reproduced experiment:

https://imgur.com/a/Ppj57cP

Note that there's no reference to his real name.

The only reference to his real name in your screenshot is the first entry, which is purple and removable because it is coming from your browser's session identity history. If this was in fact in an incognito tab, it's likely you had one or more incognito windows simultaneously open somewhere else where you had searched for him, which carried over into your new tab.

danharaj · 6 years ago
https://imgur.com/a/NwwBiIo

I did this on a computer I don't usually use in an incognito tab.

danharaj commented on Pseudonymity as a Trivial Concession to Genius   scottaaronson.com/blog/?p... · Posted by u/MindGods
throwaway4666 · 6 years ago
There's no evidence that any of the things mentioned came from SneerClub. As far as I know the original doxxing came from some alt-right dude with mental issues on tumblr who thought he was shadowbanned and posted in response to a SA reblog on tumblr 'Care to comment, Scott Alexander [Real Surname], working at [Actual clinic] in [Actual location]?' to which SA replied with 'No one's shadowbanned, you're banned for doxxing me though'. This is all relatively easy to look up and check.

SneerClub was always ever about venting about rationalists when the dumb speculation about evopsych and the IQ of black people went out of hand, and people who have attempted to doxx Scott on there have been banned. (Doxxing people at all is against the rules of reddit anyway.) Yes, it's a circlejerk subreddit, yes it's petty etc. But it's not the evil den of terrorists rationalists think it is.

danharaj · 6 years ago
If one were to examine that subreddit at this moment it would appear that the mods are very strongly against Scott Alexander being doxxed by a reporter and are also handing out bans for anyone gloating about this.

u/danharaj

KarmaCake day5234May 31, 2015View Original