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Re: World

#81

Post by girvo »

stinos wrote: post #67
asveikau wrote: post #44

Earlier quoted context omitted.

I'd also note that in a point on the unit circle, cosine is the x coordinate and sine is the y coordinate. A good reason to try flipping a cosine first. See this: http://en.wikipedia.org/wiki/File:Unit_circle.svg (I still remember how people would describe trig in high school, it is a wonder more teachers didn't explain the cos = x, sin = y thing. Probably because my teachers did not understand math.)

My teachers did explain it that way. European school, if that matters.

Same here, but in Australia. Unit circles made trig "click" for me (and a whole heap of other concepts... a very versatile abstraction that one).

Re: World

#83

Post by arikrak »

Techasura wrote: post #78

Can someone explain this?

View the source. Usually there would be a separate script that creates the animation.

In this case, the page is the source. The animation and page are one with the source.

Re: World

#84

Post by raldi »

mathrawka wrote: post #64
raldi wrote: post #50

Earlier quoted context omitted.

I'm not alleging a law was broken -- just that the author should have given credit for inspiration.

The author did give credit for the original in his presentation.

Huh? Where?

Re: World

#86

Post by agumonkey »

sillysaurus2 wrote: post #68
stinos wrote: post #67

Earlier quoted context omitted.

My teachers did explain it that way. European school, if that matters.

European school, if that matters. Heh. Yeah, that matters. In my experience, US highschools are very much "Okay class, today we're going to memorize these formulas."

Couldn't help reading 'ok glass we're going to memorize these formulas'. Ahh, the future.

Re: World

#87

Post by asveikau »

stinos wrote: post #67
asveikau wrote: post #44

Earlier quoted context omitted.

I'd also note that in a point on the unit circle, cosine is the x coordinate and sine is the y coordinate. A good reason to try flipping a cosine first. See this: http://en.wikipedia.org/wiki/File:Unit_circle.svg (I still remember how people would describe trig in high school, it is a wonder more teachers didn't explain the cos = x, sin = y thing. Probably because my teachers did not understand math.)

My teachers did explain it that way. European school, if that matters.

My experience with math education in the US is that they approach it as unapproachable. It is supposed to be some sort of magic, that only limited practitioners may understand, and even then only after an incredibly slow introduction. People teaching it are usually unqualified. Then if you're like me, when you get to college you get exposed to a lot better, then you wonder what those k-12 people were thinking. But a lot of people don't make it that far, because their earlier experience makes them think math is uninteresting or they'll never be any good at it.

Note that my experience involved going to a supposedly "good" school district. There is the entirely unrelated problem of schools varying in quality based on where you live.

Re: World

#88

Post by riffraff »

phaer wrote: post #74
sillysaurus2 wrote: post #68

Earlier quoted context omitted.

European school, if that matters. Heh. Yeah, that matters. In my experience, US highschools are very much "Okay class, today we're going to memorize these formulas."

I don't think its that easy, it depends more on the specific school and most of all on the teacher. For the record: I also had to memorize it and i went to an "european" school, or rather to an austrian one. Europe still has a wide variety of education systems.

and not all systems are uniform. I went to high school in Italy and changed something like 4math teachers.

One of them explained the x/y thing, another didn't.

Re: World

#89

Post by GrinningFool »

TeMPOraL wrote: post #77
wavesounds wrote: post #70

Earlier quoted context omitted.

This is one of the most beautiful pieces of art I've ever seen! ... and the top comment is typical negative nitpicking! Why HN? Why?! There must be a better way!

Why do we keep calling it "typical negative nitpicking"? How about calling it "feedback"? Or maybe even "the most useful type of feedback"? We're encouraged here to post things that add value. But that pretty much implies either criticism or going off-topic ("hey, I've seen something similar here:", etc.). There is no practical value in "positive" comments, no matter how elaborately you can write "I liked it". Yes, i…

I agree with much of what you said - there is significant value in negative feedback.

But here is where I disagree:

>... but it hardly contributes anything of value to anyone...

>... every valuable feedback is a kind of criticism...

Valuable feedback includes positive as well as negative. Negative is actionable feedback, but positive has just as much value in a different way.

Most people are aware that their own perceptions, thoughts, and ideas may be flawed. Negative feedback points out those flaws and should always be accepted. Positive feedback says that in spite of the flaws, there is something fundamentally worthwhile there.

And while upvotes can certainly serve as a form of positive feedback, words are even better.

I'm not suggesting that we should all post meaningless words of encouragement to everything that comes along. But if you're impressed by something you see, saying so only helps.

Re: World

#90

Post by Achshar »

aemkei wrote: post #69
nikcub wrote: post #17

It's spinning in the wrong direction!

Thanks for telling me! It is fixed now.

Damnit, it's fixed. I was freaking out that I had it wrong all along and then after rotating my fist a couple of time I was still damn certain it's moving correct. Parent should probably edit the comment that it has now been fixed.
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