AnonAccount: What is it, and what does it do? - Q&A Thread
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guides/tutorials by Betsy Pockville - Thu, 26 Sep 2013 03:14:08 EST ID:Mpud+AHb No.12970 Ignore Report Reply Quick Reply
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anybody have good simple tutorials/guides on using SAS and or LATEX?
>>
Frederick Fimmlepudge - Sun, 29 Sep 2013 07:45:26 EST ID:Sq9DosmM No.12978 Ignore Report Quick Reply
https://www.google.com/search?q=latex+tutorial

n.b.
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George Dradgeshaw - Tue, 01 Oct 2013 18:06:45 EST ID:579tY0Ye No.13023 Ignore Report Quick Reply
http;//lyx.org

Use it, and expand your knowledge of latex as you need it.


Skip lists by Charles Greenman - Thu, 10 Oct 2013 06:09:08 EST ID:J4ZzhxMi No.13065 Ignore Report Reply Quick Reply
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Yo, i'm trying to learn this skip list thing but there is a thing i am trying to figure out but i just can't get it right.

So if there's n elements and the probability that each element reaches the next level is ½, what's the probability that k elements reach level i?
I was thinking that maybe it would be something similar to
((1/2)^i*n)/k because a large n should give a high probability and a large k and i should give a low probability but when i tried that with example numbers i somtimes got probability greater than 1 so that's not right.

Do any of y'all know anything about this?
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Ebenezer Pirringhall - Thu, 10 Oct 2013 08:05:36 EST ID:qm/4Dr5m No.13066 Ignore Report Quick Reply
Now i thought that maybe it can be (1/2)^n*nCk. (1/2)^n is the probability for any combination and nCK is the amount of cases where k elements moves on to the next level.
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Nell Wemmleway - Thu, 10 Oct 2013 13:19:27 EST ID:nVQUEWJe No.13069 Ignore Report Quick Reply
The probability of an element reaching level i is 2^-i. Applying the binomial distribution for k successes after n trials gives you P(n,k,i) = nCk*(2^-i)^k*(1-2^-i)^(n-k).


help me solve this riddle /math/ by Nigger Dozzledun - Tue, 30 Jul 2013 19:05:25 EST ID:guxt8SVA No.12625 Ignore Report Reply Quick Reply
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There's a square that when you decrease the width by 6 and increase the length by 8 becomes a rectangle. The surfaces of the rectangle and the square are equal.

>What is the ratio of the circumference of the square to the circumference of the rectangle?
4 posts omitted. Click Reply to view.
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Graham Turveyshit - Mon, 05 Aug 2013 14:34:34 EST ID:UbYy48sb No.12643 Ignore Report Quick Reply
>>12625
>circumference
>square
>rectangle
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Faggy Pockwater - Fri, 09 Aug 2013 15:17:42 EST ID:zZpqHkik No.12653 Ignore Report Quick Reply
if the radius of a triangle is -1
how many apples does johnny have?
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Clara Chuffingtock - Mon, 09 Sep 2013 23:28:14 EST ID:uRpG72we No.12837 Ignore Report Quick Reply
>>12653
your mom
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CC32 - Fri, 13 Sep 2013 20:15:28 EST ID:XQCSWhl+ No.12878 Ignore Report Quick Reply
>>12653
The radius of a triangle is a trigonometric function.
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Frederick Fimmlepudge - Sun, 29 Sep 2013 07:57:50 EST ID:Sq9DosmM No.12979 Ignore Report Quick Reply
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For the squares edge length resolve to x:

x^2 = (x/6)*8x

For the ratio of the circumference:

4x / ((2x/6)+16x)

Too lazy to calculate right now, but it's probably different to Jarvis's 24:25 ratio.


Math for Profit by Eugene Sackledock - Fri, 03 Jan 2014 17:45:31 EST ID:8pMKzXmv No.13564 Ignore Report Reply Quick Reply
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If you were to focus on certain areas of mathematics with the intent to give yourself an advantage in trading securities or commodities where would you start?

The reason I ask is because I am involved in the periphery of a high frequency trading company as a network engineer. There is a crazy amount of money and secrecy involved in this but I have figured out a lot of the general mechanics of what they are doing. If anyone is interested in the tech involved I can explain it, I just would like to know more about the math involved.
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Hugh Tootwell - Fri, 03 Jan 2014 23:00:41 EST ID:qz3c7Bt+ No.13567 Ignore Report Quick Reply
Quants are big on stochastic calculus
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Jenny Fengerhall - Fri, 03 Jan 2014 23:10:19 EST ID:jPdzCuJW No.13568 Ignore Report Quick Reply
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>>13567
>Quants are big on stochastic calculus
Yes, I did some of that in quantitative finance in the financial engineering department at my graduate school. We were required to know probability theory and statistics and subsequently we studied stochastic processes and stochastic calculus. No idea if this is really representative of what's used in the real world though. There was quite a bit of emphasis on programming and computer skills in the curriculum as well.
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Betsy Honnerbog - Mon, 06 Jan 2014 10:32:13 EST ID:VY7NljGZ No.13577 Ignore Report Quick Reply
I'm not sure they even really use high-end math etc, but you can find tons of papers on ssrn.com.
A self delcared quant on elitetrader though said he doesn't read papers and that their methods are fairly simple. They make markets, it's all about execution speed etc, being the first.
If you want to land a job there you'll need great grades tho and ton of luck.


Geometry by Polly Fimmlestone - Sun, 05 Jan 2014 02:54:54 EST ID:8PJ0nVdr No.13570 Ignore Report Reply Quick Reply
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I have basically forgotten all my geometry , and I was wondering whats a good geometry textbook that isn't too advanced.

I have this book but its a bit over my head and I need a more basic book before I can use this one.
1 posts and 1 images omitted. Click Reply to view.
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Polly Fimmlestone - Sun, 05 Jan 2014 18:16:37 EST ID:8PJ0nVdr No.13572 Ignore Report Quick Reply
>>13571
Would khan academy work instead? I've tried Euclid's and didn't get much out of it.
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James Sibberpotch - Sun, 05 Jan 2014 19:14:29 EST ID:X9xjoltf No.13573 Ignore Report Quick Reply
>>13572
either a youtube series of videos, or a textbook would be ideal
i've never used khan academy for geometry, but his stuff is more conceptual, and lacks a lot of example problems which are important for figuring stuff out
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James Sibberpotch - Sun, 05 Jan 2014 19:16:32 EST ID:X9xjoltf No.13574 Ignore Report Quick Reply
MIT typically puts all their lectures up on youtube, which is awesome. So that is the youtube series i'd recommend.
nb
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Nigger Worthingshit - Sun, 05 Jan 2014 21:15:17 EST ID:8PJ0nVdr No.13575 Ignore Report Quick Reply
>>13574

The fundamentals of mathematics book is a book from the MIT press. I think the lectures would go over my head.
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Hamilton Gocklebury - Mon, 06 Jan 2014 06:06:55 EST ID:hkOnhJJB No.13576 Ignore Report Quick Reply
>>13575
the MIT lectures on youtube are actually pretty easy to follow, the teachers are great and give most stuff an intuitive feel.

also, check out "mathispower4u" ( http://www.youtube.com/user/bullcleo1/videos?flow=grid&view=1 ), his channel got way more math stuff than khan academy and has a good balance between examples and theory


Basic Math Help by Archie Blythewill - Fri, 13 Sep 2013 20:03:36 EST ID:azRZNM// No.12877 Ignore Report Reply Quick Reply
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8(-12) ÷ [5(-8) -3(-13)]
2 posts omitted. Click Reply to view.
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Hannah Claystone - Sat, 14 Sep 2013 18:10:30 EST ID:GPXa4Sku No.12888 Ignore Report Quick Reply
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When following PEMDAS, don't do multiplication before division, but with the same order of authority.
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Reuven Sandyk - Wed, 18 Sep 2013 00:25:34 EST ID:bsErm1HS No.12944 Ignore Report Quick Reply
ninty six
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Sidney Greendale - Wed, 01 Jan 2014 16:08:42 EST ID:1xiHvl+b No.13553 Ignore Report Quick Reply
why are there elementary schoolers posting on 420chan

>>>4cha.org/sci/
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Jack Boshmitch - Wed, 01 Jan 2014 23:58:11 EST ID:suSRpPRf No.13562 Ignore Report Quick Reply
>>13553
I absolutely hate that board. So much elitism. I can't tell if everyone there is a troll or seriously think they're all that high and mighty.
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James Turveywell - Thu, 02 Jan 2014 20:08:01 EST ID:7vWrd0y5 No.13563 Ignore Report Quick Reply
>>12877

8(-12) / [5(-8) - 3(-13)]

-96 / [-40 - (-39)]

-96 / -1

96


Math Forum's Good Questions by Shitting Bullydin - Wed, 01 Jan 2014 22:00:29 EST ID:LBt2XYQH No.13556 Ignore Report Reply Quick Reply
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Hi /math/, i have lurked this forum for a long time and enjoy doing the problems i see on here at lunchtime at work or whatevs.

Alot of the questions people post are due to people making simple errors etc. So i'm creating this thread for good questions that are simply 'quite hard' and difficult to do, not to help you out with your homework.

I have picked 5 decent questions i have seen on /math/ in the last while and completed them (to my satisfaction). I would appreciate feedback on how i completed them and would like more (good) questions to solve.

> pic related, its the questions i have answered.
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Shitting Bullydin - Wed, 01 Jan 2014 22:02:07 EST ID:LBt2XYQH No.13557 Ignore Report Quick Reply
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Question 1
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Shitting Bullydin - Wed, 01 Jan 2014 22:02:49 EST ID:LBt2XYQH No.13558 Ignore Report Quick Reply
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Question 2
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Shitting Bullydin - Wed, 01 Jan 2014 22:04:52 EST ID:LBt2XYQH No.13559 Ignore Report Quick Reply
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Question 3..
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Shitting Bullydin - Wed, 01 Jan 2014 22:06:04 EST ID:LBt2XYQH No.13560 Ignore Report Quick Reply
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Question 4!
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Shitting Bullydin - Wed, 01 Jan 2014 22:09:34 EST ID:LBt2XYQH No.13561 Ignore Report Quick Reply
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Question 5.

I actually struggled to get an algebraic solution to this without deriving Pascal's formula from scratch. If anyone had a better solution, I would love to hear it!

That's it from me folks, hope these questions/solutions were interesting, and i hope you can post some interesting questions too.


Wolfram Pro by Faggy Ciddlestore - Wed, 01 Jan 2014 19:09:41 EST ID:8PJ0nVdr No.13554 Ignore Report Reply Quick Reply
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Is wolfram alpha pro worth the money or should I stick with my nspire cx calculator?
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Shit Turveystock - Wed, 01 Jan 2014 21:34:47 EST ID:V2nhYpJ2 No.13555 Ignore Report Quick Reply
Nobody can answer that for you. It's worth it to you if you use it enough and get enough in return to make it worth it.
It definitely isn't worth the money for me.


pre-calc and trig probelms by here ya go - Tue, 19 Nov 2013 19:51:09 EST ID:TCsjaVXP No.13306 Ignore Report Reply Quick Reply
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These are both completable with a knowledge of precalc trig, i thought they were fun I thought someone else might enjoy them.

write a formula for the nth term in the squence 5,1,5,1,5,1

write a formula for the area of an isoceles triangle inscribed in a circle with a raius of two. based on the angle, alpha
that black dot is a center point
2 posts omitted. Click Reply to view.
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Edward Goodwater - Wed, 20 Nov 2013 17:45:51 EST ID:YUJcLNZf No.13312 Ignore Report Quick Reply
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>>13311
>>
Nigger Sonderchudge - Wed, 20 Nov 2013 22:12:18 EST ID:sPd/0oB/ No.13316 Ignore Report Quick Reply
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x = 4*cos(alpha/2)
y = 2*x*sin(alpha/2)
area = (y/2)*sqrt((x^2)-(y^2)/4)

>>13311
Hey you stole my idea!
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Charles Cubberlock - Thu, 21 Nov 2013 03:08:03 EST ID:TaVY2eI0 No.13318 Ignore Report Quick Reply
>>13316
Instead of saying "I was about to post the same idea." you decided to go and accuse me of stealing.
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Cyril Hopperson - Thu, 21 Nov 2013 21:54:10 EST ID:TCsjaVXP No.13321 Ignore Report Quick Reply
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>>13318
>>
Shitting Sungerhood - Thu, 21 Nov 2013 23:34:21 EST ID:6zddCMRD No.13323 Ignore Report Quick Reply
f(n) = 3 - 2*cos(pi*n) for n = 1, 2, 3, ...

area = 16*cos(alpha)^3*sin(alpha) (assuming the diagram indicates alpha is half the apex)


Logarithmically spaced by Shitting Smallstock - Wed, 04 Dec 2013 15:09:06 EST ID:mpgton00 No.13416 Ignore Report Reply Quick Reply
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Quick question to you guys, what does logarithmically spaced mean? does that mean a presentation of values follow a logarithmic scale? like 1 10 100...?

Thanks to anyone who helps.
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Esther Smallstone - Wed, 04 Dec 2013 19:41:54 EST ID:vPWE081V No.13418 Ignore Report Quick Reply
That's a perfectly reasonable interpretation.
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Eliza Seshbury - Thu, 05 Dec 2013 11:51:12 EST ID:yF3ktpDm No.13424 Ignore Report Quick Reply
>>13418
chhers
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Eliza Seshbury - Thu, 05 Dec 2013 11:51:51 EST ID:yF3ktpDm No.13425 Ignore Report Quick Reply
>>13424
*cheers

nb


Mathed potatoes by Wesley Pipperway - Thu, 28 Nov 2013 06:39:16 EST ID:pB5VWAoK No.13368 Ignore Report Reply Quick Reply
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Are you optimising your thanksgiving dinner?
https://www.youtube.com/watch?v=F5RyVWI4Onk&list=SPaNzoFtkQ7rZo-HKloTHnhpimhfEzDlFl


engineers are dicks by Emma Wullyridge - Fri, 29 Nov 2013 13:25:17 EST ID:sGcjTkly No.13380 Ignore Report Reply Quick Reply
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i dont know if this belongs here, but im just gonna lay it on you guys.
im just a blue collar dildo just like everyone else. my job is technical, but it is very specialized. therefore all of my knowledge of this job comes from 9 years of training and trial and error.
why is it that every engineer that i meet have this supiriority complex?
more than half of them that i meet have zero trouble shooting skills. no communication skills. and are generally wrong about every problem they are asked to "solve". and they act like they are to good to try the solutions that us "common workers" already know work.
engineers are dicks. at least every one ive ever met.
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Thomas Brepperchidge - Fri, 29 Nov 2013 16:26:43 EST ID:qz3c7Bt+ No.13382 Ignore Report Quick Reply
It's a typical engineer complex to assume they're right no matter what. Try to have fun with it by getting them to say the stupidest shit.
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Eugene Semblechud - Fri, 29 Nov 2013 22:41:25 EST ID:F9AJX/Os No.13383 Ignore Report Quick Reply
try posting this on /tesla/ see what responses you get lol
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Martin Bellerfuck - Sat, 30 Nov 2013 04:06:26 EST ID:wTslOisJ No.13385 Ignore Report Quick Reply
Most of them probably struggled through college and don't think it's fair that you should be placed on the same rung of society as them. Without knowing anything about you or how much you really know, they'll focus on that piece of paper hanging on their wall that tells them they are better than you. Just shrug it off and work continually to improve yourself. Eventually most of them will see how they're behaving and come back to reality.
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Matilda Deshworth - Sat, 30 Nov 2013 18:11:19 EST ID:8NxxczqH No.13390 Ignore Report Quick Reply
>>13380
As an engineer who personally tries not to be that guy I apologize for my bretheren, there are a fuckload of them but not all engineers fit that stereotype.


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