skysight-inc/HackerNews huggingface dataset:
Ask me a question or two about particular math notations and I will try to answer it.

I'll just go ahead and explain indices and summation in the meantime already because these are so super-common that you basically cannot read math things without knowing them. I will denote things LaTeX-like, that is subscript with _ and superscript with ^, if multiple things go in there, they will be enclosed in {}.

---

First: indices, usually written as sub-script, are super-common. They might be separated by a comma if there are more than one (but they do not have to be. In that case, you need to check which variables make sense as indices.) Usually variables are just single letters and not superWordyDescriptionsOfThingsBecauseCodeCompletionIsDifficultWithPenAndPaper.

Examples:

a_i is like a[i]

m_{ij} is element at position i, j in matrix M, i.e. ~ M[i][j]

---

Summation is also very common, denoted via symbol Σ . That's the upper-case greek letter "sigma". This one will have a few things accompanying it: below it is a variable name and most likely an assignment of a value to it. That's the first value that the variable will take. Above, the last value the variable should have. The expression behind the symbol is evaluated for each of these values and all integers in between and summed up. (It might also appear with just the varaible name below it, in which case it means: sum over all values of the variable).

Example: Summing up the squares of all integers from 3 to 6

Σ_{i=3}^6 i^2

(Properly rendered here: https://wikimedia.org/api/rest_v1/media/math/render/svg/a60f... )

Pseudocode for this is:

for(i = 3; i <= 6; i++)
sum += i^2

---

Multiplication: there is also a similiar one for multiplication that I will include because it is so easily explained when having discussed summation already. It's denoted by the greek upper-case letter Π (Pi)

Π works like Σ but the results of the expressions are multiplied instead.

Example: Π_{i=3}^6 i^2 = 3^2 * 4^2 * 5^2 * 6^2

Pseudocode:

for(i = 3; i <= 6; i++)
product *= i^2

This is only meant to help you translate a few formulas into forms you might easier work with. Following a university math course for a single semester or maybe two might get you a long way as well.
That doesn't save the confinement walls from becoming more and more brittle, it just limits the damage to those areas, and it helps recover some of the tritium it leaks.
The unravelling of Lex Greensill: a mix of bravado and financial alchemy
I’m sorry, what are you talking about?
You boot your new Mac laptop from your time machine backup and are back working within hours, not weeks.
Learning about Kalman Filters' deduced-reckoning-like combination of external observation with internal model gave me an idea about the origin of consciousness:
https://news.ycombinator.com/item?id=23475069
Also where Miles Davis was attacked by police a few months after recording Kind of Blue in 1959. He was standing outside smoking while his band was playing there, a cop asked him to move on, he refused. Then the cop "[pounded] him repeatedly on the head with his nightstick". Pics of him covered in blood:

https://milestones-a-miles-davis-archive.tumblr.com/post/127...
Syndicated, no paywall:

https://consumersadvisory.com/2021/03/05/the-unravelling-of-...
Edge does seem to support it: https://caniuse.com/?search=%3F.
If you’re an American developer looking to move abroad, a much better plan would be to first pick up a remote gig with an American company, and then move overseas. Your take home pay will be easily triple what you can negotiate from a European company.

This site takes the opposite approach of finding positions at EU shops that will handle relocation and visas. That certainly helps get you situated, but they’ll likely expect a long term commitment. And long term, you’ll leave a ton of money on the table.

I expect that’s why the jobs listed on this site don’t reveal salaries. It would kinda take the wind out of the idea if they had to tell you that none of these jobs pay more than $50k.

Ps. Still go through! It’s really nice over here. Just make sure you get the best deal for yourself.
This feels a bit elitist to me. I also doubt that there's a single unifying narrative that applies to every user of this forum.

For me, browsing HN is a low effort way to get exposed to tech stuff I might not otherwise, and read industry news and interesting takes on that news. There's nothing particularly high minded about my usage. Don't get me wrong, the high quality discussion is pretty special, but the "riff raff" comment really rubs me the wrong way.
Can confirm this works, did this 3 times in the past. 2 times no questions asked, a 3rd time I first got a message that I didn't have a support contract, but got it after linking them the release notes of the firmware in question where it said Cisco would provide it for free.
I can confirm that on personal devices with no support contract. You contacted them asking for an update image due to published vulnerabilities and they sent it over
Won't deny the intentional opacity. We haven't launched the self-service piece nor firmly defined its features. So definitely haven't solidified pricing yet.

That said, in the interest of giving you a real answer... The numbers we've thrown around for the base package are sub-$100/user/mo and the mid-tier sub-$500/user/mo. Tailored pricing for custom solutions.
Drones: Haven't drones already been used in wars? Like I remember a huge furor about drone strikes during the Obama presidency?

Self-driving: Can you elaborate on this a little more? You mean having self driving trucks on supply routes makes it much harder to break supply lines?

EVs: I think this one is already mainstream. Not in the sense that most people already have or are buying EVs but everyone from car manufacturers to bureaucrats are on the train already and it is only a matter of time.
No. It’s mainly just SF and To some degree parts of CA. It’s getting pretty bad in many parts of SF
Craigslist also got beaten because they fought becoming a unified marketplace--with lawyers.

Had they not fiercely destroyed all the various "Search all Craiglist" mechanisms, they might have had a chance at fighting FB Marketplace.
Difference Between API and Web Service
What they don't really go into in edited interview properly is that early on it also felt like open courses online could end paying for mediocre teaching, you could basically skip around doing best-in-class courses from top teachers and experts in their fields, and it didn't matter if you had no money in the world, just internet and a computer.
"The trick was to use a Cholesky factor of the covariance matrix as the dependent variable in an equivalent Riccati equation. "

I'm going to use that as my next pickup line
If you don't want outbound smb, don't allow outbound smb. Your bad firewall policy isn't exchanges fault. Bonus, blocking outbound smb also blocks the myriad other vectors for this same issue.
I've seen a few different "monitor servers from your phone" (web)apps over the years, and having tried them I don't really see the appeal. Phones have tiny screens and crippled input; you can't see much and you can barely navigate. I do see value in alerting, so maybe this is a good supplement to that? But it seems like if I get say an SMS alert "server634 at 98% memory" I'd be better off getting to a laptop because I can investigate far easier from there, let alone fix things. (Happy to hear from anyone using these, though; it does seem like I might be missing a better workflow)
It is a very complex phenomenon that can be best described with concepts that deal with aggregate matter taken from quantum chemistry/solid state physics (look up the transition from atom orbitals to molecular orbitals to bands). The classical electron hopping theory is a very primitive abstraction that suits a certain level of education.
If you're interested in the EU, there are treaties like the Dutch-American Friendship Treaty that allow you to get on the path towards permanent residence for a modest investment, assuming you're already self-employed.

https://expatlaw.nl/dutch-american-friendship-treaty

If I was going to move out of the US, I'd take a long hard look at that one.
I don't see Khan Academy or Brilliant as being the same as Coursera.
I don’t get why we’d dismiss a cheaper option out-of-hand. Easy to steel-man this one;

* economy of scale means it’s cheaper for the same quality

* egalitarian access means you don’t need X gpa to get the top classes

* online means the TAM / impact is way bigger

* lack of actual degree for most courses means you are spending your dollars on actual learning and not merely paying to signal middle-class membership

I’m not necessarily buying in to all of these but I think there’s clearly enough to justify the business on its surface. Haven’t dug into the biz metrics though.

Anecdotally a friend did Open University which is probably equivalent to the full degrees offered at Coursera, but less convenient. They spent years grinding out a degree after work. They are a data scientist now. So this path is valuable and increases access to (I’d argue overly) credentialed jobs.
Microsoft’s $10B Pentagon Deal at Risk Amid Amazon Fight
So any big company that acquires copyright to any work can successfully ban the same and you would cheer their "right" to do so.
Really cool read.
Thanks for clearing that up, I learned something today. That actually makes a lot of sense as well.

It’s interesting the BBC experts didn’t catch the difference but that’s the benefit of the internet I guess.
I love this pay-off at the end of the article, commenting on the use/ownership of a fleet of private jets:

How Greensill was able to afford such a luxury always baffled the company's rivals. As one supply chain finance executive puts it: “This is a great industry, but I fly Ryanair.”
Translation: No. and flutter sucks.
> The cost to build the plant is a sunk cost: if the reactor is expected to be reasonably profitable to operate, you can fund building it.

You're missing one important part: the reactor must be profitable enough so that it can recoup the build cost for its lifespan. The lifespan of fusion reactors, even disregarding failure modes, will be severely limited by the high energy neutrons which it generates, and which turn all materials brittle.

And maintenance for the brittle material will mean stopping the reactor, and sending in robots to dismantle and carry away the brittle radioactive walls, and build new walls in place. It may well be about as cheap to scrap it for parts (for those parts that haven't been turned to radioactive Swiss cheese) and build a new one.
Because without a ready-at-hand large-scale method of restocking (which granted is a very real possibility that such a dismissal of the fumigation theory seems to overlook, see e.g. my comment about harvest time) this is tantamount to suicide.

The difficulty required to sustain the caloric needs of a town and rebuild after complete destruction of food stores and shelter is immense, especially with only the help of pre-Bronze Age technology.
"access to active directory" is granted to every user account in a domain (how do you think address lookups work?) and isn't nearly as scary as it sounds.
I also hear what you're saying, and I agree with your point that a black person wouldn't have come up with master/slave. That said, I've also worked closely with black developers and while I don't want to make assumptions, it's really hard for me imagine them being offended by something like this. It's more like a parody of what a white person who has never spent any time with black people thinks a black person would be offended by.

But regardless, it's not that I'm so stuck on using this specific term. I don't care that much, and primary/secondary is fine, as you say. My point is that many people and groups will have more-or-less equally valid complaints about countless other words and terms, and I don't think attempting to excise all of them from our language is a helpful or productive path to go down. As many anecdotes in this thread have demonstrated, it's not "just a swing" or just a single idiom. It's already starting to snowball into a pretty long list.
The real reason must be something so stupid that no one ever considered. Something like there was a comet in the sky every 75 years and they burned the settlement to scare it away.
Hi, I'm Chris and Domain Drain is my side project. Any questions, please ask.
I get what they're saying, but in the majority of organisations the persons who spends their entire day reading Adobe's EULA and counting Oracle client installations isn't considered the sort of role that anyone has ever considered needing redundancy or full time availability until this thing broke out.
That's a nice idea - there are apps that purport (unsuccessfully in my experience) to work around the issue using software though I don't know they use that approach.

Obviously any major app supplier may be reductant to invest significant dev time to offer a workaround for an OS limitation (and Audible is just an example), but yes it's worth raising I suppose, thanks.
are they actually charging for classes now, or just certificates?
Norway is the opposite of Ontario, right?
Open University is an incredibly interesting idea to me, and apparently a respected University in the UK at least, but even with that it just doesn’t feel right.

For someone who did not take the traditional path to schooling, wanting to go back open access is amazing, but if the primary value of the credential is correlated with selectivity, I can’t help but feel off. It effectively feels like pay to play and to the average person who hasn’t heard of the school/program, does it signal more than a for-profit. I also couldn’t be sure, not being familiar with how UK programs are generally structured, but a lot of the programs looks extremely superficial, and wide, like what you would get from a low tier AS program at a bad community college. This is kinda the same feeling I had with certain degree options through Coursera as well.
Joke’s on them because all their cookies get deleted when I close the tab. And it’s not like I have a shortage of things to read.
I got the idea that "stability" here doesn't refer to crashing, but more about the fact that the computer behaves in a consistent manner.

You won't get a sudden I/O or CPU load during important operations for example.
China-Linked Hack Hits Tens of Thousands of U.S. Microsoft Customers
Very theoretically, ADL-S is meant to be released in September. This seems a bit surprising, given that people won't typically by buying systems with RKL until April - a very tight window.

RKL might turn out to have been a stop-gap measure that was only semi-needed. A lot of the hyperventilating about how much trouble Intel is in here (which is, frankly, moderately justified) ignores the fact that the desktop segment just isn't that important. I mean, it's important to me. I've been waiting for a new desktop for a while (and, despite being ex-Intel, may go Team Red). But the money is in laptops and servers. Desktop is clearly not high in the queue.

It's at the point where I'll either go Team Red (and probably buy a TGL NUC for AVX-512 experimentation) or buy an 8-core TGL "desktop replacement laptop". The power consumption is ridiculous. A lot of my argument for wanting a desktop is not having laptop-style power management wobbles while trying to do fine-grain performance benchmarking, but what kind of wobbles am I going to have on a system like RKL? 291W? 104C? Yeesh.

Supposedly the issues are fixed with 10nm in 10++ or whatever it's called (SuperFin?). We're not going to learn about that until September or whenever ADL tips up.
WSJ reports its China [0]

[0] https://www.wsj.com/articles/china-linked-hack-hits-tens-of-...
"These books were created and published in an open market." Sorry, but this is utterly false. The extraordinarily extended periods of copyright-terms enforced by the government make this the very opposite of the open market.

The marketplace hasn't rejected these ideas. The holders of the copyright - a law enforced by the government - have rejected these ideas and no one can oppose them. Because of copyright, no other publisher can publish these books in the marketplace. Ergo - no free market and an effective ban on the books.
Yeah, would really love to see a static type system that tackled this directly - ie. handling versioned nodes in a cluster and ensuring deployments happen safety. I think it would be possible, but it would require some careful thought and design.
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The Extended Kalman Filter (EKF) relies on local linear linearizations to handle nonlinearity. This works for mildly nonlinear systems, but doesn’t do so well when the system is highly nonlinear (divergence happens).

The Unscented Kalman Filter (UKF) is a kind of particle-like filter but instead of propagating a large number of points, it only propagates carefully chosen “sigma points”. It’s much more economical and works relatively well with nonlinear systems.

To me, the gold standard in estimation is the Moving Horizon Estimator (MHE) [1] which solves an explicit optimization problem to arrive at the state estimate, which allows it to accommodate constraints in the system. It is however computationally much heavier than the Kalman family of filters.

I’ve implemented UKFs in the past and think they’re a good trade off between computational speed and accuracy in the presence of nonlinearities. They cannot handle constraints however, which is a major weakness that MHEs don’t succumb to. (Imagine you are estimating a quantity x in the interval [0, 1] - UKFs can return estimates like 1.32 or -0.3 whereas MHEs accommodate bound constraints like 0 <= x <= 1 as well as more complex constraints to prevent weird outputting impossible or weird state estimates)

[1] https://murray.cds.caltech.edu/images/murray.cds/0/0d/L4-2_M...
I worked with a "Heidegger" (pretty common Swiss last name) before.

He always said he was very very afraid of being pulled over by police in the States and asked his name.
In the context of YAML, the opposite is Yemen.
AMD needs to integrate basic gpu in its higher end CPUs. With the current gpu prices where even old low end models are selling for double it will make sense for anyone needing good desktop experience without need for a fast gpu otherwise AMD is missing a market segment.
The graph had been going steadily upwards for a year and a half before Trump entered office.
So we are the Sims version 39 running in some alien guy PS45 after all. Let’s hope he doesn’t trip over the power wire or something. And would be nice if he presses the end pandemic button, he unlocked the achievement already.
Aside from sibling comment's point, here's what they link to: https://www.who.int/news/item/20-01-2021-who-information-not...

The part that primarily caught my eye, which isn't what Reuters is attempting to debunk:

> Where test results do not correspond with the clinical presentation, a new specimen should be taken and retested using the same or different NAT technology.

"clinical presentation" - in other words, the symptoms. This advice runs contrary to the entire past year, where a single positive test in an asymptomatic person has counted as a case. This alone is enough to inflate the numbers, without even taking PCR cycles into account.

And Reuters ends up just barely short of confirming the part about PCR cycles anyway:

> ”The WHO are saying that if the manufacturer has defined a value but you could if you chose to adjust that setting, please don’t - stick to what the manufacturer has stated because they have done the earlier work to determine the best value for that threshold,” Mackay said.

Labs using too high a threshold has been a concern for about half a year: https://www.nytimes.com/2020/08/29/health/coronavirus-testin... (And note the numbers in this article, almost all in the range of 33-40 cycles - I recall on rare occasion seeing higher reported elsewhere, around 45 and 50 cycles)
> Since the release of the 2nd iPad Pro Apple has forced audio processing onto the slower low power CPU core

What makes you believe this?
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A firewall is not the only way to enforce this I'd guess. If I open a shop in China and do business here I might have to comply with local laws.
That's interesting, I saw that first hand in January staying the night in twin falls-idaho. It must be doing really well. Seattle where I live, not so much. Is this something you have read about before? Or just an observation?
Visual Assist improves on what was already there, i never claimed that the functionality was the best it could have been (if anything i wrote the opposite) only that it existed.

But it is also an interesting thing to mention because in the last two C++ jobs i had where Visual Assist was preinstalled on my machine, i always disabled it because it was slowing down Visual Studio too much and the functionality VS provides is more than enough - VA does provide a bit more, but for me wasn't worth the slowdown.
https://html.spec.whatwg.org/multipage/syntax.html#optional-... describes which elements have optional start and end tags.

This document is valid:

<!doctype html>
<title>Hello,</title>
<p>World!
<ul>
<li>A
<li>B
</ul>
<table>
<tr>
<th>C
<td>D
<td>E
<tfoot>
<tr>
<th>F
<td>G
<td>H
</table>

And is precisely equivalent to this document in the canonical serialisation:

<!DOCTYPE html><html><head><title>Hello,</title>
</head><body><p>World!
</p><ul>
<li>A
</li><li>B
</li></ul>
<table>
<tbody><tr>
<th>C
</th><td>D
</td><td>E
</td></tr></tbody><tfoot>
<tr>
<th>F
</th><td>G
</th><td>H
</td></tr></tfoot></table></body></html>
There was a bug (maybe still is) in airbnb where setting your name to include a certain character would brick your login to the web app because it broke header parsing. Reported it but was deemed 'non critical'..

Edit, just looked up the mail

- It was an 'equals' sign

- the reply was:

" It sounds like you cannot cause someone else's account to be in this state, only your own account. Is this correct? How would you get someone else to change their account name so that it includes an equals sign?

It appears that there's no way to cause another user's account to get into this state, and in this case, I do not see a security implication here. "
Can you point me to a guide that shows how to use racket or common lisp on mobile operating systems like android/ios or run them as WASM web-apps ?