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Sometimes these videos can over simplify to the point of not providing a complete understanding. For example I don't think he explains what a Non Deterministic Turing Machine is, or even mention the words Turing Machine. Also not mentioned is the fact that if a Non Deterministic Turing Machine can solve a problem in polynomial time, a Deterministic Turing Machine can solve the same problem in exponential time. So (correct me if I am wrong) a problem that can only be solved in factorial time on a Deterministic Turing Machine for example cannot be part of the class NP.

He also includes Traveling salesman in the class NP. I think there is some debate about whether traveling salesman is NP-Complete, as that would require a polynomial algorithm to check whether in fact your solution was the shortest. https://www.ibm.com/developerworks/community/blogs/jfp/entry...
This was one of the most touching stories I've ever read here on HN.

I tend to read a lot of stories about people's misfortune, and how things turned around -- but hearing the story from someone in similar shoes as myself makes it feel so much more personal.

It's really scary how fast things can turn around, regardless of how 'successful' you are at your job / work. Especially if you're doing any sort of freelancing / etc.

One thing I'd really like to know is this: what can people like myself do to help others who are in a similar situation as the author? Are their specific charities that are useful for this sort of thing? As someone who wants to help out, what can I personally do to make a difference? Is going and volunteering at a soup kitchen something that's needed?

I'm genuinely interested in helping in some way -- if any of you have advice / etc. I'd absolutely love to hear it.
I think this shows the perils of relying on wikipedia for "serious" studies.

Consider Wolfi Landstreicher. I happen to know his following comes from his regular self-publication of a photocopied individualist-anarchist zine. Wolfi is a great guy and I like to have drink with him every time he hitch hikes into town from the Southern Oregon town where he lives on SSI. However, I think professors of philosophy would be aghast that he gets as many edges on the graph as many "serious" philosophers. Shows how much they know. I will certainly tell him of his coup the next time I see him.

A scan of the graph shows the whole as what-you'd-expect. It's a mix of "serious" professional opinion and the idiosyncratic opinions of amateurs and gadflies. The influence of a philosopher shouldn't be just a matter of how "sexy" they might be, I assume there's a matter of how serious work they've done - being amateur gadfly myself, I'm only guessing here of course.

It's especially instructive that the complicated graph-analysis tools that are brought to bear here seem to fail entirely at avoiding the best "garbage-in, garbage-out" principle.
Sadly I believe this to be a hoax [0] but has been used several times as an interesting plot device - notably in G Benford's short story Time Shards (which I have not read). Similarly it has been proposed that stone stores electrical mental impressions [1] - again the subject of a quite wonderful TV play written by Andrew Nigel Kneale [1]. The most interesting version of the pottery-as-recording story is the one which proposes that Jesus's voice was recorded onto pottery - once in the X Files [0] and, to my knowledge, once in a BBC radio play, where Jesus's final recorded statement is the major plot point (sadly I can't find a reference to the play - but it could indeed be based on the short story of G Benford).

Sorry to go on.

[0] http://itre.cis.upenn.edu/~myl/languagelog/archives/002875.h...

[1] http://en.wikipedia.org/wiki/Stone_Tape
Major issues with this piece include:
1. Doesn't adjust for wallets with zero, or near-zero bitcoin.
2. Does not account for large service providers like Coinbase who use only a few hot wallets that hold large amounts btc.

Some math from a commenter: "Top 99.24% of Bitcoin addresses control 32.718% of Bitcoins omitting the 67,723,836 bitcoin address containing balances of 0 - 0.001 btc amounting to 433.016 btc"
It's interesting that I've heard this argument repeatedly from people in the Docker world, yet rarely from those who have experience of implementing it in multiple organizations (I do).

The philosohpical arguments drift away as the money is saved, and the code moves to a microservices architecture anyway as the rank and file 'get it'.

In any case, the intention is not to run everything in a container, but simply get from A (snowflake servers) to B (something useful in a container).

In short, if 'doing it wrong' saves your business a ton of money, then I'm not sure how wrong that is.
That is only possible because you value money.
>> This bubble is bound to burst.
Ok, well I guess that settles it!

A bubble exists when enough people decide that it exists (and it seems that many people have decided this [1]). The mere existence of this article and the thousands like it that have been written recently are setting the stage for it. It probably won't begin to pop until the fed raises rates (likely starting next month), but it appears inevitable that a major slowdown in tech funding will occur this year. It's highly likely that a fair number of engineers are going to be unemployed by the end of the year.

[1] http://www.google.com/trends/explore#q=%22tech%20bubble%22
I don't quite follow your logic. You still need an airgapped computer to turn those random bits into a working address, don't you? Is there a way to do that by hand?

Is it more likely that the RNG is compromised than the bitcoin software?
From the abstract: "Twelve trials were included in this review... Trials were of poor quality and conclusions must be viewed as unreliable."
In the US, bushels are the standard measurement of grains, at least as far as farmers are concerned. Whenever I hear about relief being sent to a place with a famine, it is always tons of grain, so it definitely isn't a universal measurement. But prices and yields are still discussed in bushels.

Hilariously, while the bushel started out as a volume -- 8 dry gallons, which are totally different from liquid gallons -- they are now a measurement of the weight of a specific grain at a specific moisture content. So to measure a grain, you need to measure its weight and its moisture content, convert it to its weight at the specific moisture content, and then divide it by the standard weight for the grain. So if you have a thousand pounds of corn at 20% moisture, it is just under 17 bushels, but if it were soybeans, just over 15.
Not to mention that in that era, titles were often US$39, $49 (or more) and in today's dollars that would be much higher. Compare to most apps on the app store that are typically $4.99 or less... certainly makes paying for titles a lot more palatable for the would-be pirate.
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This is the shamanic trial. Your ego died, you have been reborn with new wisdom and experience of the abyss.

[1] https://www.wingsofpeaceinternational.org/pdf/Shamanic_Journ...
I skipped the last half. It's very possible to make climbing articles gripping, this had too much filler.
Is the long term goal to create a new library (why not in boost) or to test new ideas to extend the language ?
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I've made something similar but in Swedish:
http://matsidan.com/

What goes well with what is based on around 5k recipes.

Haven't worked on it for some time though, kinda got stuck. What I'm trying to solve is to make it easier to make a weekly food plan and grocery list.
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> It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse.

So they're basically the middle eastern version of Evangelical Christians (who happen to be in control of the US government)...
But still can't make a profit ? At some point the numbers have to match how much assets and profit the company is actually generating. Uber's profit is nowhere even near 5% of its valuation.
NP = Set of problems for which candidate solutions can be checked for correctness in polynomial time in the length of the input.

P = Set of problems for which we can find a solution in polynomial time in the length of the input.

Clearly, P \subseteq NP. Proving P = NP would require proving NP \subseteq P, something which most people would believe to be a) highly unlikely b) difficult.
The author is on Patreon: https://www.patreon.com/darmonrichter?ty=h
If you fear competition, than you probably shouldn't be in the startup game.

Even if someone can replicate your product, they can't replicate your sales/marketing efforts (especially if it is very personal).

This is why your inferior product can sometimes own 80% of a market, either through being first-to-market (with a big enough marketing budget) or cultivating strong relationships with your clients that them walking away from you to a 'better' product would hurt them in the long-run.

Don't feel afraid to share your working product (sharing ideas is a wasted exercise these days - especially when we all have 'great' ideas).

Part of patio11s success with Bingo Card Creator was probably his blogging, not that he has the only "bingo card creator" software out there in the world.
I found the fundamental point pretty insightful, that its going to be weird if you are a founder of some company that is saying its worth a couple of billion and you've got a few percent of the common stock equity, that "feels" like you are rich[1] as your "projected" net worth is millions. And then the bubble bursts and you aren't anymore. If you have your self identity wrapped up in that then having the bubble burst will be really hard to handle.

[1] Been there done that :-)
While watching that let's not forget that at least in Europe we also have "ghost cities".
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First of all, this was a very touching post. I'm glad things worked out in the end.

I have a question which I definitely don't mean to be taken in the wrong way, so please just take it as a purely informational query. If I were to find myself in this situation, my first instinct would be to move back in with my parents or otherwise lean on my network of family and friends (couch-surfing, etc), especially if I was reduced to homelessness.

Please feel free to ignore this question if it's too personal, etc, but were family/friends not among your list of available resources, or if they were, was there some other reason you couldn't/wouldn't go there?
Impressive effort, but pretty chthonian syntax. And that's with using macros. Main take away from this for me is that pattern matching needs to be a language feature to see pervasive use.
I have Lion, Mountain Lion, Mavericks, and Yosemite running in VMWare Workstation. They work well enough to do web testing in Safari, but the video performance has been too slow to do much else, so I don't use them for anything too serious.
Semi-related: https://localize-software.phraseapp.com/posts/best-practice-...
>they treat it as an insult

I treat that as an insult. As if their ego is more important than me not being launched through a fucking windshield.
The argument as I've seen it is that society will be better off in terms of various measures: equality, innovation, opportunity, peace, etc. That seems easier to sell than anyone "owing" anything.
There is no debate, plain travelling salesman is defiantly not known to be NP-complete. The usual solution for optimisation problems is to turn them into a decision problem, by saying "is there a path of length k or less?". Then it is in NP-complete
This seems like a non-sequitur, since the Indian filter coffee you linked to commonly incorporates both Arabica and Robusta beans.

> "The most commonly used coffee beans are arabica and robusta."
To clarify your last point, P and NP are classes of 'decision' problems, i.e. problems for which we have a yes/no answer. TSP is commonly formulated as a combinatorial OPTIMIZATION problem

The decision version of TSP would be formulated as: Given a complete graph G and a budget b, decide if there exists a path that visits each node and has cumulative weight less than b.

If you have a solver for decision TSP, then you can solve the optimization version of TSP by performing binary search on the budget b.

I'm glossing over some details, but there's a clearer explanation on how to solve search problems with an oracle for decision problems in Sipser.
Read the sibling's reply. I was going to say exactly that. See the 2nd sentence in my comment? It's not without meaning.
There is an alternative, equivalent definition of NP languages, through projections of certain polynomially bounded and P-verifiable relations. This is the strict mathematical base for the commonly spread and very valid observation, namely that for a decision problem to be in NP means for its solution to be verifiable in polynomial time.

Traveling salesman is in NP. There is no point debating this.

Edit: as others have pointed out: traveling salesman in in NP only when it is in its decision version. Otherwise the question does not make sense, as standard complexity classes are defined for decision problems, this is - for languages.
Haha, I should stipulate that I don't mean to diminish how special anyone's particular 15th-century greek-revival saltbox bungalow is. That was kind of my point.
So yeah in the video, traveling salesman should not have been included in NP
More specifically, it's departed employees.

Current employees have had it drummed into them enough times that the EV of their equity stake isn't likely to be significant and they should negotiate for cash over equity. Worst comes to worst, their options go underwater but they're still highly compensated professionals with in demand talents.

Founders knew the risks when they negotiated the terms of the funding round and they have nobody to blame but themselves if they got too greedy with spending.

Departed employees though, have to face the choice of whether to exercise options before they expire or forego them and potentially lose out on a huge payday. They're the ones who have to put up real cash into the system for paper gains.
A similar thing happens in casinos.

A person sits down to play a slot machine but then they turn to their friend to say something. When they turn back to face the slot machine "Where is my money! I put money into it!"

They didn't put any in a review of surveillance video shows they didn't. The customer then looks in the envelope they carry thei cash in and see their money is there.
Ask HN: Most usefull productivity trick?
Hey HN,

I wonder what have been your most usefull productivity trick you have implemented in your life? (Apart copy and paste!)

Example: For myself, it was actually an easy searchable copy and paste history. (using currently Alfred one on Mac.)
Great comment. In a way, it's like what Geoffrey Moore talks about in his book "Crossing the Chasm", about the difference between early adopters and mainstream users.
Yes, how would they even cancel an order with another company? What are you talking about? I have never claimed that they canceled my order.

They do however own the money on your account as long as you keep the money on your paypal account. They had just pulled the money back from the sellers account and gave it back to me again (much later). At that time the SEK->UK pounds exchange rate was much lower and the bank transfer usually ends up a few percent cheaper that paypal too.
>He also includes Traveling salesman in the class NP. I think there is some debate about whether traveling salesman is NP-Complete, as that would require a polynomial algorithm to check whether in fact your solution was the shortest.

It's kind of imprecise, but the understanding in these situations is that you're talking about some bounded version of the problem. In TSP, it's common to mean the problem of "is there a solution of length less than N", and you're only verifying that the length is less than N, not that it's optimal.
Security Essentials is bundled starting with Windows 8, but it's been renamed to "Windows Defender". Same thing though.
I'm not sure I agree with the placement of debt. It is often the case that you can you off the debt, but the money invested properly could increase faster than the debt increases.
Apropos of nothing, these rules seem mechanical enough to be codified as software. Has anyone done so?

P.S. A more specific link would be the "Titles" subsection, http://www.princeton.edu/communications/services/editorial/r...
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I've come to the conclusion that the most important thing by far is a different password for every site. If you do nothing else, figure out a way to do that. It's probably also a good idea to make sure that your security question answers are anything but the actual answers to those questions. I prefer looking up random words for each one, and storing them in the Lastpass entry for the site.

I view password complexity and obsessing over how hard it would be to crack your password hash with various setups to be of little value. If they're far enough in to get your password hash, it's better to assume they can see and do anything and everything on the site even if they can't crack your password. If you've actually used a different password on every site, there isn't much left to worry about. Still, if you're using a password manager, it's cheap to make all of your passwords long, random strings with upper, lower, numbers, and specials, so why not do it?
It was not a two day dispute, they just pulled back the money after two days and then I had to wait for a very long time to get the money back.
There is. The evolution force is an iterative updating process. Fitness can be one-dimensional like "number of likes" or "payoff in a game". Keep feeding in variety and the selection process will do its job.
That's definitely useful, but the current Rust playground already does this (sorry for not being clear in my post). I meant a more full-featured history where you can view multiple previous edits, not just restore the last one.
I notice the "Not VCs" portion of the original title has been removed here.
I just watched the movie last night for the 2nd time, thinking that I was in for a completely fictionalized story, because I had uncritically accepted sensational blog titles like the one you linked to.

Turns out, the movie is a rather good depiction of the struggles that Nash went through. He published a groundbreaking paper as a grad student, married Alicia, suffered from schizophrenia, and learned how to manage it, eventually going back to Princeton as a damaged but wiser man, and worthy of a Nobel prize in economics. All of these major points were covered in the movie.

Nash himself found the movie to be close to reality, except that it may have suggested that he went back on newer antipsychotics--see the interview he gave to a Nobel reporter 10 years ago[1]. In fact, the movie was much more fair to his point of view than he admitted in the interview.

Some details of his life were left out, but his reputation as the "Ghost of Fine Hall" was preserved. I see the film as a fair presentation of his life, especially compared to the Hollywood standard for "true stories"--see The Hurricane, American Gangster, JFK, etc.

[1] http://www.nobelprize.org/mediaplayer/index.php?id=429
Python 3 gets type hints, Javascript gets types (via Facebook's Flow), now C++ gets pattern matching. Seems like every successful programming language will eventually try and become ML (with meta-programming).

Robin Milner, you had it all sussed out in the early 1970s, it took the rest of the world about 40 years to catch up!
The graph shows Thomas Aquinas as more influential than Duns Scotus. As much as I admire Aquinas, I dispute that.

When I was in seminary, one of the guest lecturers told us of how he was in Rome, doing his dissertation, and he needed to consult a work by Scotus. He went to one of the Vatican libraries and requested the relevant book. He struck up a conversation with the librarian, saying "You must not have a lot of copies of Scotus' work." The librarian disagreed, saying "Oh no. We have more manuscripts of Duns Scotus than we do of St. Thomas."

Except for a brief period during the Council of Trent, the works of St. Thomas Aquinas were almost forgotten from the time shortly after his death until Pope Leo XIII revived his reputation. Graphs like this do not reflect the change in influence over time.
"is /api/thing the wrong path" - is fixed by hypermedia, so 404 generally means that resource cannot be found.
'Beautiful Mind' mathematician John Nash, wife killed in car crash
There have been other stories of "ghost towns" which eventually filled up with people. Perhaps this is just one of those. I always find it fascinating but I also note that a major disaster in a city like Beijing and there is already a bunch of places to house people post disaster. I don't know if anyone else thinks about it in that way but from a civil defense perspective it seems interesting to have "back up" cities waiting.

For other Person of Interest fans I found that Ordos was a ghost town interesting from that aspect of things as well.
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> There is no debate, plain travelling salesman
> is defiantly not known to be NP-complete.

Actually, there is no debate, plain TSP is specifically not NP-complete and cannot be, because it's not a decision problem. So it's not just, as you say, "not known to be" but instead is "known not to be".

However, by using binary search you can convert a decision version of TSP into the optimisation version in polynomial time. In this sense it is perfectly reasonable to refer to TSP as being NP-Complete.

I agree completely that these sorts of differences actually matter when dealing with the technicalities, but in practice it makes sense not to worry too much when trying to explain the broader concepts.
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Then those posts should be blocked, not his good ones. Sorry, but this guy is not abusive. And "hellbanning" is just the creepiest way to moderate a forum.
I couldn't get passed the first paragraph, which made it clear the article offered very little substance.
Not to mention the draw on electricity, which probably points back to some undisclosed amount of coal being burned in a power plant, somewhere nearby...
Nothing here that isn't in the earlier article on the front page: https://news.ycombinator.com/item?id=9596160
> I can't believe the number of people I've seen running practically whole operating systems inside a container.

What's wrong with this?

I mean, technically, all containers are all about running the entire userland of an operating system; it just happens that we usually use very small values of "operating system" when we do this.

If you run a proper init system inside the container, you don't have to deal with the issues that come from having orphaned processes inside containers. And this ends up being a far more meaningful way of encapsulating components that are tightly linked into a single high-level unit.

The only reason that this is an antipattern with Docker is that the Docker runtime doesn't properly handle a lot of things like signal handling or process monitoring for non-init processes, which means you have to reinvent the wheel if you want to have multiple applications running reliably in a container. But that's a limitation of Docker specifically (and one that will hopefully be solved), rather than a fundamental premise of containers in general.
The way password crackers work now, it is quite easy to crack passwords that are combinations of words, even with alphanumeric substitution. The best passwords are completely random, and 24+ characters.
Agreed. Another recent incident on the turnpike was the crash that injured Tracy Morgan (comedian) and killed another. If the NJ Turnpike isn't the place to wear a seatbelt then I don't know where is.