daniel-levin

16 ms·

91.
by daniel-levin 11y ago
Yes, I say so by way of example: Sama Group [1]. They run several non-profit businesses. >> Established in 2008, Samasource is a non-profit business that connects marginalized women and youth to dignified work via the Internet >&gt
92.
by daniel-levin 11y ago
The main goal of mechanics is finding solutions for important variables of interest, from which every other dynamical variable can be easily computed. In fluid mechanics, the main objective for a given problem is finding a velocity field (o
93.
(South African) Students storm gates of Parliament in ‘fees must fall’ protest(bdlive.co.za)
2 points by daniel-levin 11y ago|0 comments
94.
Why There Is Only One Finite Cyclic Group (Up to Isomorphism)(daniel-levin.github.io)
2 points by daniel-levin 11y ago|0 comments
95.
by daniel-levin 11y ago
Coward has justifiable grievances with the UCB mathematics department. It must be extraordinarily depressing to work hard at exposition of lower division mathematics to a class of otherwise largely unmotivated students, only to be fired for
96.
by daniel-levin 11y ago
Agreed. Feynman diagrams are a great example of this phenomenon. They might be 'pictures', but they are still mathematical notation.
97.
by daniel-levin 11y ago
It is interesting to see kids invent their own perfectly adequate, if peculiar, notation. In the first example with the quadrilaterals, the answers were all right. The math is not wrong, just written differently.
98.
by daniel-levin 11y ago
I agree with the premise that it is destructive for students to merely learn tricks in order to pass classes. However, the existence of tricks is enormously useful once understanding the underlying mechanism of a particular tool is not the
99.
by daniel-levin 11y ago
>> Though the proof has not undergone a rigorous peer review, experts expressed no concern over whether it would survive a critical look. Such is people's confidence in Terence Tao - not unfounded by any means - but the result ha
100.
by daniel-levin 11y ago
Many of the comments in this thread follow a similar pattern. They are all essentially derivatives of Goodhart's law. [0] >> Once a metric becomes a target, it ceases to be a good measure. It's quite useful to have a name -
101.
Landau's Theoretical Minimum, ITEP in the Beginning of the 1950's (2002)(arxiv.org)
18 points by daniel-levin 11y ago|1 comments
102.
by daniel-levin 11y ago
Greenspun's Tenth Law [0] is a humorous aphorism that applies here. >> Any sufficiently complicated C or Fortran program contains an ad-hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp. [0] http:
103.
by daniel-levin 11y ago
Are you the same Jim Hefferon who wrote the free (as in freedom and beer) linear algebra text [0]? If so, I'd first like to thank you (your book is great) and then agree that it is possible to publish a .pdf online. That said, patio11
104.
by daniel-levin 11y ago
Shameless plug: here is my GPL'd MATLAB implementation of Chebyshev approximation [1] [1] https://github.com/daniel-levin/numerical-methods-3/blob/mas...
105.
by daniel-levin 11y ago
You can use both at the same time for extremely nice results. Compute some truncated Chebyshev polynomial approximation (i.e. the first few terms) and then use Pade approximation [1]. The cool part about this is that you can prescribe your
106.
by daniel-levin 11y ago
This could also be because students are already familiar with doing numerical computations in MATLAB from courses they'd done before. It is conceivable that students that take a machine learning course have already done some numerical
107.
by daniel-levin 11y ago
>> “Obesity has traditionally been seen as the result of an imbalance between the amount of food we eat and how much we exercise, but this view ignores the contribution of genetics to each individual’s metabolism,” says senior author
108.
by daniel-levin 11y ago
>> Rated for -30°C to +50°C [1] -22F ~ -30C [1] http://www.getohm.com/
109.
by daniel-levin 11y ago
Hi Hunter How much safety testing have you done on your battery? Specifically, if an Ohm battery is involved in a collision, how will it fare? I know you are not content with shipping anything you aren't comfortable with your own famil
110.
by daniel-levin 11y ago
It seems as though Google (Alphabet) is splitting its business divisions into: 1) Google - a company comprised of reliably profitable products that run at massive scale (search, video, mobile, mail etc), and they know that Sundar Pichai can
111.
by daniel-levin 11y ago
On the contrary, the first line of the abstract reads "Machine learning offers a fantastically powerful toolkit for building complex systems quickly."
112.
by daniel-levin 11y ago
No, this is absolutely not the first (correct) proof that infinitely many prime numbers come in pairs! That is the twin prime conjecture, and at the time of writing this comment, steadily remains a conjecture. I wonder why Nature , a pub
113.
by daniel-levin 11y ago
Another advantage: Uber is robust to changes in country-specific conditions such as legislation and disruption by ordinary taxi drivers. If Uber is made illegal in one country, it can still exist a business in other countries.
114.
by daniel-levin 11y ago
This is very close to the model of private active security in wealthier suburbs of Johannesburg [1], [2], [3]. Crime in suburbs got so bad that residents are prepared to pay for active patrolling. There are 24 hour patrols by armed guards,
115.
by daniel-levin 11y ago
Back in the day, HN's reaction to Dropbox was also extremely negative [1] [1] https://news.ycombinator.com/item?id=8863
116.
by daniel-levin 11y ago
Well, no, it's not empirical until we design some experiments to test the theory, make predictions, test them, come up with potentially observable data that would falsify our hypotheses, publish our results and let them be peer reviewe
117.
by daniel-levin 11y ago
From an io9 article on the same research: >> [Hu] and Dickerson constructed a flight arena consisting of a small acrylic cage covered with mesh to contain the mosquitoes but permit entry of water drops. The researchers used a water je
118.
by daniel-levin 11y ago
Better coverage of the same research can be found here [0], with no statements such as "300 Gs is a crazy amount of pressure" [0] http://io9.com/5916251/why-can-mosquitoes-fly-in-the-rain
119.
by daniel-levin 11y ago
Telegram is really cool. I have long thought about what additions and modifications I could make to my mobile texting program. Now I have to convince all my friends to move from Whatsapp.
120.
by daniel-levin 11y ago
OK, what the hell is going on here?

More ›