alphaBetaGamma

15 ms·

91.
by alphaBetaGamma 16y ago
s/energy/entropy/ and then proof read.
92.
by alphaBetaGamma 16y ago
That's what Newton said. If you want to nitpick, the only thing we can say is that the black hole's birth is in our past light cone.
93.
by alphaBetaGamma 16y ago
On the other hand, you should definitely continue "playing around to see what I could make". That's how you become a hacker (not to be mistaken with a cracker).
94.
by alphaBetaGamma 16y ago
The binomial heap http://en.wikipedia.org/wiki/Binomial_heap It's a heap supporting merging in log(n). While it's usage might not be very common, it is a beautiful data structure.
95.
by alphaBetaGamma 16y ago
Sorry, this I'm completely wron... I mean: I was testing if you read the comments before upvoting. The 1/2m v^2 vs m v points to an exhaust speed as low as possible, to get as much momentum as possible from as little energy expenditure as
96.
by alphaBetaGamma 16y ago
You are right, this is plain wrong. You always want to have an exhaust velocity as high as possible. The energy you have to impart to the exhaust is 1/2 m v^2, but you get m*v momentum. So small exhaust mass at very high speed will give yo
97.
by alphaBetaGamma 16y ago
??? "ArXiv is mostly for crackpot physics" ??? The entire string theory community publishes all their papers on hep-th before sending sending them to journals (which nobody reads as everything is on ArXiv). Of course, maybe you will arg
98.
by alphaBetaGamma 16y ago
"Any type of event that has nonzero probability will happen infnitely many times(...). This undermines the basis for probabilistic predictions of local experiments. If infnitely many observers throughout the universe win the lottery, on wha
99.
by alphaBetaGamma 16y ago
This is for continuous walk. As you say, in one dimension you will visit all the points. In two dimension the random walk is dense, so you pass arbitrarily close to every point in the plane. As the dimension increases beyond two, it gets le
100.
by alphaBetaGamma 16y ago
To give a specific example: In three and more dimensions, if you start a random walk outside some sphere there is a non zero probability that the event "the brownian motion enters this sphere" never happens. Funnily, in dimension one and
101.
by alphaBetaGamma 16y ago
This is very exiting: his new technology will truly revolutionize many technological fields, and lead to huge savings for humanity (and make him one of the riches guys on earth in the process). Unfortunately... extraordinary claims need ext
102.
by alphaBetaGamma 16y ago
For the people who would go for an analytical solution rather then monte-carlo: for a large number of prisoners the probability that they all find their numbers tends to 1 - ln(2) ~= 0.3069
103.
by alphaBetaGamma 16y ago
There does exists a strategy to get %50 for two people (hint below). But the case of two people does not help much to solve the more general case (imho). HINT: Suppose each prisoner picks a box at random. They can (randomly) decide what box
104.
by alphaBetaGamma 16y ago
As others have said, I think focusing on HFT is a bad idea. You are going to be in competition with other players in the market. What are your weaknesses compared to them: 1) You are alone; you are competing with teams mixing 3-4 math/phy
105.
by alphaBetaGamma 16y ago
I had a great system for the kind of documents that you will only need in the far future, or not at all, but for which it would be a major issue if you actual need them but can't find them: tax stuff, receipts, statements, bills... For this
106.
by alphaBetaGamma 16y ago
I think your understanding of the benefit of the stock market is flawed: the length of holding does not impact the fact that you are providing capital to companies. The only time money goes from investors to companies is at public offerings
107.
by alphaBetaGamma 16y ago
Not a data blip after all, but the trades where canceld. From Bloomberg ( http://www.bloomberg.com/apps/news?pid=20601087&sid=a3ti... ) : A total of 19 trades of 100 shares each were executed at 1 cent in seven seconds from 2:47 p.m.
108.
by alphaBetaGamma 16y ago
You buy CDS's on greek debt. But this is not available to retail investors.
109.
by alphaBetaGamma 16y ago
Probably a data issue. On a data source used by professionals it 'only' when down to 38.5 before going up again.
110.
by alphaBetaGamma 16y ago
Yes, all (ex) AAA-rated derivatives of subprime mortgages are highly correlated. No, that (in itself) does not make them more risky. You just do not want to invest %100 of your portfolio in them. E.g. U.S. Government debt is currently AAA r
111.
by alphaBetaGamma 17y ago
The statement (infinite && not periodic) ==> (any finite sequence is in it) is not true. \a number could have a decimal expansion that is not periodic but does not include certain digits. E.g: write Pi in binary and consider the
112.
by alphaBetaGamma 17y ago
Put in the least amounts of skills that will still land you an interview. Writing "basic knowledge of Java" adds a lot of credence to "expert in C++".
113.
by alphaBetaGamma 17y ago
While I have personally never programed life critical stuff, I interacted closely (on the algorithmic side) with people who did. This was in the railroad industry. They used a subset of C (no malloc...) and had a safety certified compiler.