jibiki

13 ms·

91.
by jibiki 17y ago
Grandparent, e.g., the parent post of the parent post.
92.
by jibiki 17y ago
> http://en.wikipedia.org/wiki/Orthogonal_convex_hull Ah, that's what I was missing, thanks.
93.
by jibiki 17y ago
> If you have the points in the convex hull and a set of points representing each hole, then rectangularization should be easy because the convex hull should be rectilinear. I don't follow. aa aa bbbbbb bbbbbb cc
94.
by jibiki 17y ago
> In short, no matter what the class's level, mathematics definitely needs to be taught from a more problem-solving, integrated perspective. I'm always looking for examples of how this is done. How did you learn how to solve problems?
95.
by jibiki 17y ago
Considering when you created your account, and the subject of your post, "troll" seemed like the most likely explanation. Sorry about that. (It's sort of a typical troll to make a technically incorrect statement and then watch people get
96.
by jibiki 17y ago
I am on the fence about whether this is a good troll or a bad troll. It certainly exploits the "someone on the internet is WRONG" ethos of HN, but I don't think it does so in a particularly amusing way. I'm going to say that it's a rather
97.
by jibiki 17y ago
I don't think it's obvious enough to really have viral appeal. Also, it makes you seem like a sociopath (jumping into a stranger's car, while they're driving, seems more like a crime than a prank.) On the other hand, it is funny.
98.
by jibiki 17y ago
> But, though there are a thousand different histories that can be written about any event, some historical perspectives are more useful than others for answering particular questions. This seems like a really good way to evaluate histo
99.
by jibiki 17y ago
I'm fascinated by comments like this one, which relate a historical narrative explaining what motivated some event. How do I tell if it's true? What would it mean for it to be false? If it's true (which it is, presumably,) could you tell
100.
by jibiki 17y ago
> calculus isn't that important for mathematicians > Many pure math classes require no (or very little) calculus. These are not the same thing (hence my confusion.) Your initial comment seemed to indicate that nobody does analysis
101.
by jibiki 17y ago
> calculus isn't that important for mathematicians That's a joke, right?
102.
by jibiki 17y ago
There are vast sections of mathematics which cannot be understood without first understanding limits. There are very few areas of mathematics which require understanding infinitesimals.
103.
by jibiki 17y ago
I remember we had the square problem as homework in 5th grade. The triangle problem is more difficult, since parity matters (I think.) But I did come up with a solution which seems correct.
104.
by jibiki 17y ago
Someone on HN recommended www.nciku.com . It's down at the moment, but it can recognize drawn characters (I can't draw at all with the mouse, and it still usually gets it correct when I do it.)
105.
by jibiki 17y ago
He was computing the probability of a Hamming distance of exactly D instead of at most D. To get the "at most" version, you could just add up the exact ones, but it's better to just use the central limit theorem instead. As for your math
106.
by jibiki 17y ago
> What other subjects don't you approve of? Psychology? Philosophy? History? I suspect you'd find a surprising number of people on HN who think (most) psychology is bogus. Ditto for philosophy, nutrition, economics, etc. Any field whe
107.
by jibiki 17y ago
"Hurd will be out in a year (or two, or next month, who knows)" :)
108.
by jibiki 17y ago
> Reals form a group under multiplication. I think his point was that 0 has no inverse. So in the literal sense, the reals are not a group under multiplication (although obviously, when somebody says "the reals are a group under multip
109.
by jibiki 17y ago
> Love one another - Be a generous, helpful person - Accept personal responsibility - Don't have a sense of entitlement - Honor and cherish your spouse - Don't mislead or abuse children - Honor your parents - Be proactive - Resist confo
110.
by jibiki 17y ago
I guess someone has to mention the scene from American Psycho: http://www.youtube.com/watch?v=qoIvd3zzu4Y
111.
by jibiki 17y ago
Sigh. Here we go, a definition of the real numbers. I'm only doing this once. Let's look at the set of all cauchy sequences of rational numbers. A sequence of rational numbers is just a map N->Q. We write a_0, a_1, a_2, ... for the
112.
by jibiki 17y ago
> Kind of an interesting idea, actually. (Of course, that's after only looking at it a couple minutes... the idea might fall apart under more scrutiny) Yes, it is an interesting idea, and yes, it falls apart :) (As I pointed out lower
113.
by jibiki 17y ago
0.0...1 is a very interesting number. Normally, one indexes digits by integers (there's a first digit, a second digit,...) But here you have digits seemingly indexed by ordinals. The omega-th digit is 1. I don't think you can make a con
114.
by jibiki 17y ago
> The precision to which you need to compute phi in order to compute the Nth Fibonacci number by exponentiation is the precision you'd obtain by computing the ratio of the Nth and (N-1)th Fibonacci numbers This seems true empirically, b
115.
by jibiki 17y ago
Vaguely related problem: say A and B are sets of size n. How fast can you sort A+B = {a+b | a in A ; b in B}?
116.
by jibiki 17y ago
So people immigrate because they want to vote in US elections? What kind of change in American policy do they wish to effect? Wanting to vote seems like a very abstract motivation for making such an immense personal sacrifice. All of the
117.
by jibiki 17y ago
> does the nerd vs. jock divide seriously exist? Well, most of us, when answering that question, end up generalizing from one example. Either: "at my school, everyone was either a nerd or a jock; therefore, at all American schools, eve
118.
by jibiki 17y ago
There are a number of articles with this sort of tone: http://www.vdare.com/sailer/051016_football.htm "Or, possibly, the reason that teams with a higher number of white reserves have been winning more games is because whites are better t
119.
by jibiki 17y ago
I would think that about 90% of Sailer's articles are too trollish for HN. (Consider the title of his book about Obama: "America's Half-Blood Prince".) This article, however, made a very salient point, which I have heard from other people
120.
by jibiki 17y ago
I'm pretty sure I have the third one, but not two or four.

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