evanb

12 ms·

121.
by evanb 2y ago
If the graph is an undirected graph the adjacency matrix is symmetric. People study the eigenvalue spectrum; the largest eigenvalue is bounded by the highest degree of a vertex in the graph.
122.
by evanb 2y ago
You're very close to understanding to quantum eraser experiment / the even more upsetting delayed-choice quantum eraser. Even though it sounds as though your arguments are gotchas that prove quantum mechanics to be nonsense, it
123.
by evanb 2y ago
Also a physicist. It's not quite right to call basis vectors particles, even in a free field theory. The particles correspond better to the creation / ladder operators that take you from one Hamiltonian eigenstate to another. In
124.
by evanb 2y ago
The messages used the fact that 1,000,000 = 1000 x 1000. But of course 1,000,000 has many other factorizations. Were there messages in any of those? I guess next time you pick a prime (or a semiprime) if you want to make it harder (or eas
125.
by evanb 2y ago
0.9333... is equal to 9/10 + 1/30. To get 9/10 + 4/100 I think what you're aiming at is 0.93999...
126.
by evanb 2y ago
Sequences can approach things. The sequence 0.9, 0.99, 0.999, 0.9999 and so on asymptotically approaches 1. The difference between 1 and the Nth term in the sequence is 1e-N, which goes to 0 with N. 0.999...[forever] is not a sequence, it
127.
by evanb 2y ago
It's likely you read it wrong; there is no sense in which the universe's expansion has a fixed speed. The Hubble parameter is speed/distance [the figure's axis is km/s/Mpc, for example]. That is the natural
128.
by evanb 2y ago
If causality isn't then what do you mean by 'because'?
129.
Parametric Matrix Models(arxiv.org)
66 points by evanb 2y ago|7 comments
130.
by evanb 2y ago
See also: A Few Goodmen: Surname-Sharing Economist Authors, by Goodman, Goodman, Goodman, and Goodman https://scholar.harvard.edu/files/joshuagoodman/files/goodma... (Para)bosons, (para)fermions, quons and ot
131.
by evanb 2y ago
Not exactly. There's no "compile time" or whatever. The point is that the computational complexity characterizes the difficulty of mapping an input to an output. Sorting a list can be done with lots of different algorithms
132.
by evanb 2y ago
This is explicitly expounded upon in the original: > The deeper lesson Sipser was trying to impart is that the concept of computability applies to functions or infinite sequences, not to individual yes-or-no questions or individual integ
133.
by evanb 2y ago
It's possible to use gaussian variables and use gaussian error propagation, for an implementation see https://gvar.readthedocs.io/en/latest/ which is critical for the lsqfit library https://lsqfit.
134.
by evanb 2y ago
T+LC cabs use Curb, which can call taxis and be used only as a payment method. https://www.gocurb.com/
135.
by evanb 2y ago
Unusually, the county of New York (coextensive with Manhattan) is only 1 of 5 counties inside the city of New York (which of course inside the state of New York).
136.
by evanb 2y ago
Here's a critical take on geometric algebra: https://alexkritchevsky.com/2024/02/28/geometric-algebra.htm... tl;dr: GA's geometric product is a mixed-grade differential form, which is quite weird.
137.
by evanb 2y ago
What surprised me in the article was > “The goal of our Car Thing exploration in the U.S. was to learn more about how people listen in the car,” the company said in an emailed statement to TechCrunch. The goal was not to build a consumer
138.
by evanb 2y ago
My non-blockchain bank already puts such a limit (amount electronically transferred per day). If you need to move more than that you've got to do more than just use the website.
139.
by evanb 2y ago
DC is divided into 4 quadrants, and to lift degeneracies they come after street/avenue/road/place etc in an address. So many GPS pronounce 815 V St NW as "eight-fifteeen V saint northwest" instead of "... stre
140.
by evanb 2y ago
I could see faint streaks from central Berlin. No doubt it’d look better from a deep darkness but even in the city it can be seen tonight.
141.
by evanb 2y ago
negative-semidefinited
142.
by evanb 2y ago
I flew Aer Lingus recently and the flight had exactly that: 1 free item of checked luggage, pay for hand luggage (except an under-the-seat-in-front-of-you personal item). It worked great except that the bag-check process was absolutely ter
143.
by evanb 3y ago
Maybe just --star
144.
by evanb 3y ago
The paper where Einstein introduces special relativity is really explicit about just providing a new way to think, not new mathematics. It starts out with explaining that there are two explanations for the same electrodynamical physics dep
145.
by evanb 3y ago
Lawfare had an interesting discussion recently: https://www.lawfaremedia.org/article/the-lawfare-podcast-how...
146.
by evanb 3y ago
Indeed! But it is beneficial to have additional formalisms; it gives you hints about what kind of modifications to 'normal' physics might be possible.
147.
by evanb 3y ago
That's not the kind of model it is. The standard model is one example of a quantum field theory. You should think of Wolfram's idea as a different formalism (ie. not QFT), not a different example. It so happens that Wolfram&#x2
148.
by evanb 3y ago
I found Burke's Barrage http://libraryofjuggling.com/Tricks/3balltricks/Burke'sBarra... MUCH more difficult to learn than Mills Mess. The needed move is so much faster and your arms 'follow each ot
149.
by evanb 3y ago
I have a little python package for making images of Littlewood polynomials (and others). https://github.com/evanberkowitz/littlewood
150.
by evanb 3y ago
> we will use a massive particle moving at nonrelativistic speeds In a non-relativistic the inertial mass and rest mass are the same.

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