skysight-inc/HackerNews huggingface dataset:
It's not so much a question of mathematical use. In mathematics ideas are normally judged for implications for the rest of the field. This leads to a self perpetuating notion of what's important (things are important simply because they are).
The notion of rearranging the digits of an integer has absolutely no mathematical significance. Because we represent numbers by strings of digits it's a very intuitive idea but I can promise you it will never lead to "significant results" as pe the current academic notion of mathematics.
Furthermore mathematics has always been a search for generality. The more general a concept is the more cases to which it can be applied and normally the more impressive it is the mathematical community. I personally find this substantially more reasonable. Rearranging the digits of a number isn't even general to the concept of integers. It's dependent on the fact that we write our numbers in a base of ten. If this theorem held in other bases (like binary numbers) then that would be kind of cool.

On another note the author uses the word kernel when I think he wants "fixed point". Kernel doesn't really have a meaning in this context.
6174 it's the only real solution of this system of equations:
9 ≥ a ≥ b ≥ c ≥ d ≥ 0
abcd - dcba = ABCD
Here are some searches that are better for me on search.twitter than on google:

1) My name and company name

2) When I'm at a party and I want to find the after party

3) I'm moderating a panel and I want to see what people think

4) When I'm NOT at a conference and I want to read what I'm missing

5) When the building shakes, I search "earthquake" to see if what's going on.

6) When I want to see if others are also having trouble with an iPhone app

7) When I want to see if a company responds to its customer service issues
Probably not all that much, in the big picture

http://www.wired.com/science/discoveries/news/2007/09/dayint...
Here's a recent twitter story for me: A few weeks ago, I was sitting in my living room, and I heard a bunch of emergency vehicles. I went to the local live 911 site and saw that there was a large heavy rescue response at the interchange between two major highways; 18 vehicles. My wife was searching local news sites; nothing. I went to twitter search, searched for one of the highways, and immediately found someone who was twittering from the scene, and taking photos. That's pretty powerful stuff, but at present, also probably rare. But as more people start to pulse more immediate information into channels like this, along with metadata (as automatic as possible, like location) this dynamic will become more common. And potentially abused.
As you've said, why pay, when you can use the free version on-line? You have to give them something for their money. You have to differentiate between the free version and the one they pay for.

Graphing is one option, but you'll need to think of more. There's also the problem of people paying, downloading, and then giving it away to others. Do you not worry about this? Or do you somehow "lock" the download to that user. Be very, very careful about preventing someone for using something they paid for. If their machine breaks and they get a new one, with the program still work? How can they move it?

And so on.

The real point is that people will only pay if they get something in return. Think carefully about what that might be.
We actually celebrated when it rolled over to a billion. Was a heck of a party.

Sadly I doubt I'll be around in 2286 when we get another digit, but I can look forward to turning a billion on March 13, 2015.
Are you positive that's true for all bases?
Microsoft to open its own stores.
Do you have a citation for that anecdote about sentencing guidelines?

How long do you think these guys would be serving if they were laundering drug money rather than money derived from jailing children?
Not only that, but where there is an IQ test with questions, there's a Google with answers.
Yes, these are all good points. I really want to find a way to keep the online version for free. The advantage of the download (desktop version) is that users can run in a borderless window with six color schemes and the ability to close the side palette.

I'm sure there are many students in poor countries that enjoy having a nice powerful online calculator that is easy to use, but nice is not a good business model.

We don't have a good way to prevent pirating and my thinking was that even top products like Adobe get cracked pretty quickly and distributed (so I figured it was a lost cause...)

Anyway, we have plenty of great ideas for additional features that we can add into the palette. Maybe we make a "pro version" that has these extras...
A Lottery for People Who Are Good at Math
Before you start fantasizing that maybe MS is going to get creative and storm onto the scene with AppleStore 2.0...

Note that the VP for Retail Sales Stores will be David Porter. Article notes, "Porter spent 25 years with retail giant Wal-Mart."

Yet MS says the stores will aim "to transform the PC and Microsoft buying experience." Transformers, indeed.
Having a semi-gated community can work. One of the best places for statistics/business/intelligent discussion in baseball is sonsofsamhorn.net - you need to get invited to get a membership, but there's a "Sandbox" that non-members can post to. Anyone can read SOSH, but the quality stays high due to mostly only qualified members posting/discussing.
A more elaborate explanation can be found here:

http://www.milliondollarideaguy.com/blog/?p=185
http://twitter.com/greg_allard I mostly do @ replies, links to my blog posts, or what beer I'm drinking (microbrews, nothing boring)
A little conceptual snippet from GEB:

Everything in mathematics can be seen from a "meaningless" perspective. In some sense everything from algebra to complex analysis can be stripped of meaning by thinking of them as just "a rearrangement of symbols according to a set of arbitrary rules".

And, somewhere, that's really all they are.

It's only once we apply an interpretation to these operations that they become "math". Same with numerical rearrangement. Just because it seems like it's just a algorithmic manipulation doesn't mean there isn't an interesting interpretation of the meaning somewhere.

To be pathological, take the phrase X2YZ to mean "X + Y = Z if X < Y and Y - X = Z if Y > X" and both 1234 and 3241 are true. Now that manipulation suddenly has a whole lot of (silly) meaning.
That's my point, exactly - it'll likely take years for anything getting angel funding now to have much of an effect on the economy. Google isn't even in the top 50 list of US corporations, according to the Forbes 2008 list.

It bears repeating that I'm not knocking what you guys are doing - quite the contrary, I think the best thing most of us can do is just do what we do, well, and hope for the best. I just don't think that your conference will do all that much to get the US economy going again, nor should it be expected to.

Edit. Whatever, people, if you think that PG and company are going to single handedly have more of an effect than billions of dollars in taxes or tax cuts or infrastructure spending or GM failing or more banks going under, or China selling their dollar assets, or whatever, you're welcome to your beliefs, I'm done arguing the point.
Raw natural ability can be pretty crippling to development in most fields. But people with raw natural ability who also develop discipline, humility, a willingness to fail/endure/persevere come out to some of the most amazing people of all time.
Just as an aside, using Ruby to access the db server via Net::HTTP should limit the performance to at max a few dozen http requests per second per (Ruby) process.

I think the more http is used to bridge web architectures, the more critical this aspect will become for Ruby.
can try going for affiliate links for graphic calculators, but I don't think it'll monetize that well
This is actually a great improvement. I've developed a couple of applications on GAE, and it was very difficult to do anything non-trivial without generating "High CPU" warnings. I think once they get task scheduling in (part of their recent road map), the platform will become a lot more viable.
I work for Accenture. I know they have a good presence in Europe, and lots of Java jobs.
When looking for info on Breaking News
Just because there is no name for this operation does not mean it is not valid (or meaningful). There are many mathematical constructs which do not have any physical meaning.
Wow ... corruption is more insidious than I thought. I thought such corruption happened only in developing nations like mine.

I think its a problem with humans, corruption, no society is free from it.
We tried creating a calculator store and linking to Amazon, but the conversion is pretty bad there as well. If people are looking for an online calculator they don't real want a handheld... Thanks for the feedback.
Pet Project: Developing your own text editor where to start?
With so many text editors out there packed so many awesome features(textmate,coda,eclipse,komodo,e-text editor, intype) still I have this somewhat ambitious idea- to create my own. I'm into web development particularly and I'd like to stick my goals to it. Right now I'm quiet overwhelmed I have this problem in determining where to start.

Any helpful ideas?
I'll look into it briefly, and though I haven't finished evaluating all my options, I get the notion that quadtrees were used for static collision detection culling, or it was precomputed for a model.

In addition, I think different trees have different insertion and deletion complexities (don't know which is which yet). I need something, like the other commenter says, that doesn't penalize for adjusting the tree.

Thanks for the heads up though.
Quick Fire Profits 2.0 Reviewed
By now I think most people in the world are online or have access to the internet. What most don't know is that there is a huge amount of income to be made for a minimal cost of even for free!
waiting for the "Life of Pi" as a movie. Night supposedly (rumor ??) has the rights to make a movie, would be an awesome one...
But no support for developers outside the US/UK selling apps. Very disappointing :\

My app can't run on an iphone and I'm from Canada, so I can't use Android's priced market. Maybe I'll be able to finally hawk my wares at the BB Store whenever they launch it.
Even the Taliban love their iPhones (scroll down to Feb 7th)
Greenspun's suggestion is not a serious one. It is certainly earnest, but it is also impractical to the point of being laughable. Can you imagine an politician, of any ideology, seriously taking this suggestion and lasting more than a few months at it before they are overridden by congress, or the courts, or someone else comes in to give it a try? Its purpose is not honest suggestion; it is instead designed to make Greenspun and those who agree with him feel good about their beliefs, and perhaps convince interested readers to entertain a similar belief system as well.

If you really want to give Obama suggestions, and you really want them to be taken, you ought to make them feasible.

The way forward is via productive compromise and incremental progress -- and that's one of the ways in which libertarianism fails completely: when has any of you ever suggested a small step? Instead you snipe from the margins about the philosophical inequity of it all.

Further along the lines of not articulating a vision for the future:

- The vast majority of suggestions are negative -- what we must not do or change -- rather than positive.

- Libertarian policy is exclusively derived from absolute philosophical first principles with zero consideration as to empirical effectiveness, side effects, or how-do-we-get-there-from-here. It's nice for utopian fiction and useless for the rest of us.

p.s. I like how you brush aside so much of the ugliness of that era as "incidences." Assume I take you at your word that things "fiscal" were generally Good: how were things "liberty" then, hmmm? (A rhetorical question.)

(edit: paragraph breaks missing in a few places)
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Even if I'm not a U.S. citizen?

That's kind of worrying...
What language do you want to work with?
When Sockets Attack: DNS & DHCP
Do you have to file some paperwork to be officially accredited, or is simply meeting the wealth or income criteria sufficient?
Wow - interesting stuff.

Though, one major plus for diet drinks is that lots of times when people think they're hungry, they're actually partially dehydrated. This is really, really common, and drinking a lot more water, tea, and non-dehydrating liquid goes a long way to help weight loss. Anecdotally, after a knee injury two years ago, I put on a good amount of weight in a short period of time. When I went to cut back down a year ago, I drank a ton of diet sports drinks, and then just planned to each 350-600 calories 3-6 times per day, and executed on my plan. When I was hungry outside of my meal times, I just slammed a diet sports drink or seltzer water, and it worked well for me. Even if artificial sweeteners stimulate more appetite later, or don't satiate well, the gains from hydrating yourself could likely be worth it. But I suppose you could just use water, tea, or something else instead of diet soda.

Final thought: I think people notice a lot of heavier people drinking diet drinks, which might seem to support the theory, but there could be some causation/correlation error there. People with slower metabolisms and people who are already above their target weight are more likely to drink diet drinks. People with ultra-fast metabolisms are more likely not to worry about it.
Well, I think you need to decide what you expect to get out of the experience.
Though I somewhat agree with minalecs as to why would you apply if you were never going to attend?
I also think that if you were just trying to justify your business/messaging, well, you now know (or have a good indicator) that you've got it right.
Thanks for the suggestion. I've also had someone else suggest voronoi diagrams for dynamic points.

Looking up quadtrees briefly, made me happen across this:

http://www.cs.berkeley.edu/~demmel/cs267/lecture26/lecture26...

Apparently there are adaptive quadtrees that can be used. Go figure. It'll probably take a bit of time for me to sort through it all.
I went to this last year (of course it was easy for me because I live in Denver). It was a great event with a lot of useful information. It is a great opportunity to meet the people who will be making the acceptance decisions and hopefully make a positive impression. Foodzie, one of the companies that made the cut last year, did a nice job of this; they gave everyone a piece of candy packaged with their logo.

If you have a team together already and are good at meet-and-greets, I say fly in. If you're a solo founder and/or not that interested in meeting, pitching, and networking, it may not be worth the time and expense.
One should not confuse the rate of change with the question of whether or not such change is actually occurring.

In other words, I think HN needs more than casual self policing to buck the trend, even if it doesn't really seem too bad at the moment.
This is a valid idea - though there are already a ton of calculators on the iPhone store and so we'd be competing against a saturated marketplace. One reason we did this project was the fact that most online calculators have terrible user interfaces and don't support things like complex numbers, or a traditional stack.
direct link: http://www.nytimes.com/2009/02/13/us/13judge.html
Before you start, think long and hard if your problem hasn't already been solved. I'd be doubtful if I can create a text editor on par with even the average. If you thought about it, long and hard and realized that you really do want to write one, I'd start by downloading the source to one of the open ones (pick one: http://en.wikipedia.org/wiki/List_of_text_editors#Free_softw..., but avoid emacs it will be too complex for you) and study how they solved the usual text editor problems, and where it went wrong. This should also be able to teach you about the common way to construct the architecture of a text editor.

Pick a set of features you want to start with and how you will interact with it. Pick what language/API/platform/etc you want it to work under and start reading docs and thinking how to go about writing your own.

Not to discourage you, but you probably won't be able to match most editors having never written one before. If you just want a hobby project, it be useful to start it for the experience. It might teach you a lot about software, or however, it might just frustrate you.

edit: What is your experience in? What kind of code do you write now?
To me, this list doesn't seem out of place here. Here's my stab at why:

I've seen a few of these movies, and if the rest of them are in the same vein: they make you work to figure out what's happening in the film; and they sometimes mess with your perception of the world around you afterward. They are intellectually gratifying to watch.
I have to admit I'm into Ruby and PHP mainly, but I have this idea of extending it too.
So he spent 25 years running an insanely profitable data-driven company.. and thats bad? For Microsoft, I mean.
The usual suspects counts more as a movie where you have the OH THAT MAKES SENSE feeling at the end of the movie rather than pure mindfuck.

While you will have to rethink the whole movie once you've reached the end, you are left with some sort of answer. Some of these movies on the other hand, like Memento, will make you wonder WTH really happened for hours and days after actually watching it.
Shouldn't being more narrowly focused make them more efficient?
I'd start with Scite.

http://www.scintilla.org/SciTE.html

http://en.wikipedia.org/wiki/SciTE
http://twitter.com/immad
I'm http://twitter.com/geuis
Dividing medians by medians is not safe; you get weird interactions between differences by region and differences within each region. (Houses in Manhattan are smaller than houses in Cheyenne, and also cost more, because the cost per square foot is higher; but in both Cheyenne and Manhattan, bigger houses cost more. Except when you get into the ghetto/non-ghetto distinction, etc.)

Also I don't think the medians you cite are anywhere close to correct. Maybe they're correct as medians only within the US? I remind you that the US is less than 5% of the population.

Otherwise your figures look good to me.

Maybe the right answer here is to pay attention to your current region. I'm paying about US$350 per month (before taxes) for 60m², about 600ft². For me 40 books per square foot means each book costs about ⅝¢ per month to store. I think that's about US$0.68.
Philosophically HN is different than reddit and Digg in that the person who runs the site is active in shaping the ongoing conversation.

While true, I don't think this matters in the long run. Reddit's founders are pretty active, and clearly the decline started prior to the sale.

What I do think though is that the items you bring up work to accelerating the effect, certainly.

(Oh, and someone give the parent a free up-mod since I hit the down arrow when I was copy/pasting his comment. Thx)
The problem is that you don't know what you don't know. I see a lot of libraries, articles, technologies, etc that I wouldn't otherwise see, and wouldn't know to Google.

Not sure I explained that well, but I think you can get my meaning.

Twitter can be a distraction (and I let it be more than I should), but like anything else it can be managed.
Isn't the constant dribbling of e-mail distracting? No, because I can go check it when I want to.

Twitter does, however, provide me with insights into the people I know (business or otherwise) and keeps me on the edge with developments in several communities I'm involved with. For example, I'm a Ruby guy, and so I follow a lot of Rubyists.. you can bet I'm pretty clued in to brand new Ruby libraries, etc, as they come out (or even just in a very quiet personal beta).

Explaining Twitter is next to impossible. Unless you've been using it in anger for a few months, you don't have a clue what it is, but then suddenly.. one day you do.
Only 5% of the population lives in the US. $200k in Buenos Aires is a mansion.
I was about to mention them but you beat me to it. I was subscribed to the GenXMs Yahoo group for a while and always found myself thinking, "A lot of these people are total idiots". The group seemed to be dominated by right wing trolls. I unsubscribed in disgust and rarely attend any Mensa events. I thought the high IQ requirement thing would keep the riff raff out, but I learned by experience that stupidity knows no bounds.

In any case, scoring high on an IQ test really only means that you can score high on a test designed for you. Ever read Isaac Asimov's essay 'What is Intelligence, Anyway'?

http://talentdevelop.com/articles/WIIA.html
You should have terms in your convertible note agreements describing a "qualified financing," which should be the condition on which investors can convert to equity. Usually this gives investments in series A range, much much more than YC would invest.
It has scroll bars! :)
Wow, I think you just sold me a Kindle. I'm not even kidding. That was really amazing. Thank you.
If the purpose of this is to teach yourself a new language or a new functionality that you haven't previously coded, then sure go for it.

If it is for pay, or possible pay, then by all means dive in and see what you can do.

But a purely for fun project with copious alternatives that handle the vast majority of what you're trying to do and have the ability to be extended, means you'll eventually run out of steam and realize you can just use these other tools. I've been working on a twitter app for months and I've run out of steam. I have plenty of ideas and improvements, and as none of the ones out there really allow extensions, I'm still plugging away at my one, but I've taken absurdly long to get a lightly functional app.

Be warned, that way lies madness.
Have they gone to plaid?
Actually, as a follow up here.. is there actually anything you can use the Internet for that doesn't require either you or a third party caring about the activity of another party? I suspect there is.

Weather, perhaps? Stuff like e-mail, most news, IM, chat, or whatever are ruled out though, even this very site.
It may seem casual, but remember that this is a benevolent dictatorship: nobody has any illusions about this being anything other than pg's project, and that's a really good thing for the future. It means that there's one unifying vision for this site, and it's one that's powerful enough to keep people here, and it's a good enough one to make it worth being in. If something goes bad, he has control over fixing it.
Not just for YC companies. I've gradually come to believe that the number of viable startups is more a function of the amount of angel investing going on than any other factor. VCs are useful in getting really big, but without angels startups don't survive to the point where VCs are willing to invest.
Lunch Money Adds Up to Cash Cow for myYearbook
Yep! Last week on my blog I wrote something that went like this: "Technique without personality is craft. Personality without technique is shit. Together you get art." And it's the same for intelligence: you can be disciplined without being that bright and still bring your focus towards doing something. You can be bright and unfocused and fascinate people without ever getting big things done. It's when you bring the two together that you get incredible things.
Before understanding the best option, you should examine your user base a little more.

10K a day sure, but what's the breakdown? Do you have 2K that visit the site 5 times a day, every day? That lends itself well to the subscription model. Are most of your visitors in and outs from google, with no recurring vistis? Ads might be the better option here. Are most of your visits coming from .edu domains? There may be an opportunity for school sponsorship here. Etc, etc.

You need to fit your monetization model to your particular user base.