[QUOTE=Number-41;43260136]So you visit Reddit eh?[/QUOTE]
Yes. I downvoted it from /r/math when it showed up.
Get this silliness off my srs mathematics forum.
I got a 3D projection of a Calabi-Yau 6-fold for Christmas!
[IMG]http://i44.tinypic.com/wgwmw.jpg[/IMG]
Looks awesome, but I have no idea what it is, explain?
Superstring theory predicts 10 dimensions, and the 6 above our normal 4 spacetime dimensions will be in the form of Calabi-Yau manifold. What I got is a complex 2-dimensional slice of one (there any many Calabi-Yau manifolds) projected into real 3D space.
[editline]26th December 2013[/editline]
It's fucking purdy. Can be hard to see sometimes though. I might end up getting the light base for it. Needs a black background and lighting to show up well. I was worried it would be smaller than it looked but it's actually quite big.
It irks me that a lot people boast that they don't need algebra & calculus in everyday life, yet ever so often they wonder why division by 0 isn't possible, or why x^(-2) for x tending to 0 equals infinity. Occasionally thinking about these things in everyday life seems motivation enough to me to actually know this shit...
I feel like people who don't use algebra in their everyday lives don't use it because they don't know it. Or they're just boring people. Calculus I understand, but really... algebra?
[QUOTE=JohnnyMo1;43432254]I feel like people who don't use algebra in their everyday lives don't use it because they don't know it. Or they're just boring people. Calculus I understand, but really... algebra?[/QUOTE]
Knowing how to do optimization problems is pretty useful. Not the most difficult calculus though.
[QUOTE=Falubii;43444245]Knowing how to do optimization problems is pretty useful. Not the most difficult calculus though.[/QUOTE]
Definitely useful, especially in business applications.
Optimization was one of my favorite topics in my pre-calculus and calculus classes. It's by far one of the most useful things I've learned.
Here's a probability question: Imagine I have a bag full of marbles and one in every 20 marbles in the bag is green. Suppose I calculate how many marbles I will have to draw on average before I get a green one. If I explained this problem to random people on the street, how many would I have to ask before one of them realizes the average number of draws necessary is not 20?
Would the answer (to the question, not the joke) just come from 1/20+1/19+1/18+...+1/n until the sum is approximately 1? And then the number of terms would be the number of draws (13 in this case)?
[QUOTE=Falubii;43454628]Would the answer (to the question, not the joke) just come from 1/20+1/19+1/18+...+1/n until the sum is approximately 1? And then the number of terms would be the number of draws (13 in this case)?[/QUOTE]
No. It depends on the number of balls.
If there are 20 balls, it would be 10.5, since the green ball is equally likely to be any one of the first 20 balls (and the average of 1 to 20 is 10.5).
If it's a 'large' number, it would be approaching 20, but since (we assume?) it's a finite bag, it's always strictly less.
I see. I read the problem incorrectly and interpreted it as 19 marbles plus a green marble in a bag.
I couldnt find an appropriate thread to post this, but everyone in here is a good candidate.
The FAA (Federal Aviation Administration) will be doing Off The Street (OTS) hiring for Air Traffic Controllers in February. Must be 18, have three years of employment, under 31 years of age, and be able to pass medical/drug/psych exam. Sorry this looks to be US only.
No experience or degree required. The job posting will be on USAJobs.gov. You are applying for the AT-SAT which will determine your eligibility for hire. Minimum passing score is a 70. If you score high and get selected the FAA will send you to their school for further training.
The AT-SAT will consist of
[quote] Air Traffic Scenarios Test; Analogies; Angles; Applied Math; Dials; Experiences Questionnaire; Letter Factory; and Scan.[/quote]
Dont be concerned if you dont know one or more of them. My father scored an 83.5 on it without any knowledge of aviation.
Sorry if this seems like an ad for something weird. Just thought if anyone was looking for a new career that it might be something to look at.
I hear that air traffic controllers have one of the most stressful jobs on the planet.
Fucking contour integrals, shit's hard yo. My complex analysis exercises exam was torture :(
Do it the Feynman way: Disregard contour integration, differentiate under the integral sign, acquire Nobel prize.
Where do you guys go when you want to find a math challenge problem, or something to get you thinking? I just finished up Calc 1, and I'm looking for something to pass the time before I get back to school.
Pick an area of math, find a textbook, start reading.
[media]http://www.youtube.com/watch?v=2FWLjnzU30c[/media]
Physics professors are silly.
Lecturers with weird/bad handwriting are like the worst thing ever
[t]https://dl.dropboxusercontent.com/u/30829668/Screenshots/Screenshot%202014-01-17%2002.00.21.png[/t]
Those 9's are infuriating to read, looking all 'g' and whatnot. Some even look like the letter S or a hastily-written 5
[QUOTE]"Visualizing four dimensions is easy. All you have to do is visualize 'n' dimensions and let 'n' be 4." — Linear algebra professor[/QUOTE]
[QUOTE=JohnnyMo1;43658765][url]http://math.stackexchange.com/questions/175561/is-the-following-matrix-invertible/175567#175567[/url]
Pants-shittingly elegant.[/QUOTE]
I'll rate you funny after I take linear algebra.
Ramanujan was a truly amazing man
'I went to visit him while he was lying ill at the hospital. I had come in taxi cab number 14 and remarked that it was a rather dull number. "No" he replied, "it is a very interesting number. It's the smallest number expressible as the product of 7 and 2 in two different ways."'
[url]http://en.wikipedia.org/wiki/1729_(number)[/url]
So he did that at least twice :v:
Mine was a joke based on the anecdote in that article.
Well shit that went totally over my head. I just saw the quote and thought it was a similar crazy feat of him without actually realizing that it was about the number 14...
[url]http://genealogy.math.ndsu.nodak.edu/[/url]
It's really cool seeing that the supervisor of the supervisor of the supervisor of the... (15 times over) of your lecturer was Gauss or Leibniz
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