jdhwosnhw

8 ms·

31.
by jdhwosnhw 1y ago
It’s the title of the original article…
32.
by jdhwosnhw 1y ago
The 21 cm line was chosen specifically because it’s the brightest line in the radio regime in our galaxy. Any civilization in the Milky Way capable of developing electromagnetic sensors would see that emission. There is a game theoretic com
33.
by jdhwosnhw 2y ago
Do you mean, the first returns false and the second returns true?
34.
by jdhwosnhw 2y ago
Do you know how to program? It’s super easy to write a very simple rejection-based program to estimate the volume of a hypersphere (you can do it in <10 lines with numpy). Try it yourself for dimensionality 50 and see how long it takes b
35.
by jdhwosnhw 2y ago
Sorry, yes, you did miss the point. Specifically for the case of estimating volume, you just need enough points interior to the hypersphere to get good sampling statistics (which would become a problem in and of itself, by the way, at suffi
36.
by jdhwosnhw 2y ago
Because if you are trying to draw samples from a hypersphere via rejection sampling from samples of the hypercube, your sampling efficiency will go down exponentially with dimensionality. A smaller and smaller percentage of your samples wil
37.
by jdhwosnhw 2y ago
I have yet to see differential entropy used successfully (beyond its explicitly constructed-for purpose for calculating channel capacity). Similar to your thought experiment is the issue that the differential entropy value depends on your c
38.
by jdhwosnhw 2y ago
> If I say "well I suppose you'd at least need to do A to qualify" and then later say "huh I guess A wasn't sufficient, looks like you'll also need B" that is not shifting the goalposts. I dunno, that s
39.
by jdhwosnhw 2y ago
Peoples’ memories are so short. Ten years ago the “well accepted definition of intelligence” was whether something could pass the Turing test. Now that goalpost has been completely blown out of the water and people are scrabbling to come up
40.
by jdhwosnhw 2y ago
Yes, we have several techniques for detecting exoplanets, and at least two of them have that bias. However, what I said still holds - our best estimates are that most stars with planets have (at least some) planets in orbits closer than is
41.
by jdhwosnhw 2y ago
> Smaller stars last longer, but they also emit less energy and so there is less likely to be higher life forms just because there isn't enough energy to support life. This isn’t really true. The energy density at a planet’s surface
42.
by jdhwosnhw 2y ago
Norton’s dome is a valid paradox, in the sense that the math really does admit two valid equations of motion. The link you provided doesn’t dispute that fact (other than commenters pointing out that you need a proportionality constant to ma
43.
by jdhwosnhw 2y ago
For point source astrometry, there are a few ways to beat the diffraction limit. For instance, some observers will purposely defocus their optics to spread the target photons over a larger number of pixels, which with sufficient SNR lets yo
44.
by jdhwosnhw 2y ago
Ah shoot I never thought of that. I wonder if there’s a sneaky way around it? You’re right, that definitely impacts the utility of the algorithm.
45.
by jdhwosnhw 2y ago
While I agree with your general assessment, I think your conclusion is a bit off. You’re assuming 1kw/m^2, which is only true with the sun directly overhead. A real-world solar setup gets hit with several factors of cosine (related to
46.
by jdhwosnhw 2y ago
That reminds me of my favorite algorithm, which can find the majority element in a list with any number of distinct entries while using O(N) time and O(1) space (provided a majority element exists). I sometimes pose deriving this algorith
47.
by jdhwosnhw 2y ago
Imagine that same reasoning applied to the car itself. Ugh, wheels?? Humans get around just fine bipedally, so cars should have legs too.
48.
by jdhwosnhw 2y ago
Boltzmann had a whole lot of math backing up his assertions. Among the many issues with what you posited, I highly doubt you have bothered to actually check to see if the force necessary to keep electrons from colliding with the nucleus wou
49.
by jdhwosnhw 2y ago
> It also keeps the electrons flowing around the nucleus, but not into it. Asa cautionary note to other readers, this statement is not consistent with any theory of which I am aware, and it’s certainly not a concept accepted by mainstre
50.
by jdhwosnhw 2y ago
Sure - https://www.nsf.gov/mps/ast/env_impact_reviews/arecibo/eis/F...
51.
by jdhwosnhw 2y ago
I worked and did research atobservatory for my PhD - you are exactly correct. It was well known to the scientists and onsite engineers that a collapse was imminent, for years. Ironically, prior to the collapse the agency responsible for fun
52.
by jdhwosnhw 2y ago
The column mass (ie, the spatial density multiplied by the length of the observer’s line of sight through the material) is highest at the limbs when looking at a gaseous shell. So shells like this look like rings from all angles. A related
53.
by jdhwosnhw 2y ago
The existence and success of the Millenium fund is a (probabilistic, to be fair) disproof of your assertion.
54.
by jdhwosnhw 2y ago
The parent comment said nothing about using deep learning. Convolution is not the same as using a CNN. I interpreted their comment as meaning they used a 2D convolution (presumably a 2D cross correlation, actually) to find regions of overla
55.
by jdhwosnhw 2y ago
This isnt a correction to your post, but a clarification for other readers: correlation implies dependence, but dependence does not imply correlation. Conversely, two variables share non-zero mutual information if and only if they are depen
56.
by jdhwosnhw 3y ago
Another issue is that likelihoods associated with continuous distributions very often have units. You can’t meaningfully assign “magnitude” to a quantity with units. You can always change your unit system to make the likelihood of, say, a p
57.
by jdhwosnhw 3y ago
It was Nixon https://www.ams.org/notices/199610/page2.pdf
58.
by jdhwosnhw 4y ago
From a physics perspective, complex frequency results in “evanescent waves” - ie, waves that decay rather than oscillate (technically a fully complex frequency of the form a+ib will both oscillate and decay)