420chan now has a web-based IRC client available, right here
Leave these fields empty (spam trap):
You can leave this blank to post anonymously, or you can create a Tripcode by using the float Name#Password
A subject is required when posting a new thread
[*]Italic Text[/*]
[**]Bold Text[/**]
[~]Taimapedia Article[/~]
[%]Spoiler Text[/%]
>Highlight/Quote Text
[pre]Preformatted & Monospace text[/pre]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists


Community Updates

420chan now supports HTTPS! If you find any issues, you may report them in this thread
RNGs by Caroline Crummleville - Fri, 10 Jan 2014 00:40:43 EST ID:G4lGyG09 No.13597 Ignore Report Reply Quick Reply
File: 1389332443035.jpg -(34265B / 33.46KB, 400x329) Thumbnail displayed, click image for full size. 34265
Anyone know of a way to ACCURATELY predict dice rolls for RNGs? Specifically I am looking to predict dice rolls for Blood Bowl: Chaos Edition.

There used to be a program that did it but since then they made a patch and moved the algorithm and seeds to the sever side.

Anyone got ideas on how to do this?
5 posts omitted. Click Reply to view.
Samuel Secklesat - Wed, 22 Jan 2014 12:10:17 EST ID:G4lGyG09 No.13630 Ignore Report Quick Reply

It uses a mersenne twister with the seeds kept server side.
Jack Handermen - Fri, 24 Jan 2014 11:00:18 EST ID:sPd/0oB/ No.13631 Ignore Report Quick Reply
It's hard to do, really. The whole point of moving the seed to the server side is to make it almost impossible...

You could keep a sequence of random number (the original 32/64 bits sequence) fresh from the server, check how the seed is choosed and try to brute force the seed from here. For instance if the seed is a timestamp (it's common), pick several timestamp around the one you think is likely.
Even then you would need to keep track of how fast the RN are produced (is the server giving RN from the same seed to everyone?).

You need to decompile the server binaries to do that. If you don't have them, it's a lot harder.

You should ask this on /tinfoil/.
Ebenezer Movinghall - Mon, 27 Jan 2014 05:07:56 EST ID:DFb+IUXc No.13638 Ignore Report Quick Reply
Why not?
Shitting Grimstock - Mon, 27 Jan 2014 13:46:27 EST ID:pJYYYREs No.13639 Ignore Report Quick Reply
1390848387982.png -(145633B / 142.22KB, 1920x1080) Thumbnail displayed, click image for full size.
There's nothing that some social engineering and espionage can't solve, Gentlemen.
Mangus von Vaginakowski !qrtrbnpccM - Wed, 08 Oct 2014 20:56:00 EST ID:K3z3WKaF No.14414 Ignore Report Quick Reply
Without access to the server or an exploit the DEVs fucked up on and left that allows you to do the [P]RNG, you're SOL.

Trig sub by Hedda Snodham - Tue, 07 Oct 2014 22:22:34 EST ID:9Czw1b2g No.14410 Ignore Report Reply Quick Reply
File: 1412734954064.gif -(2075656B / 1.98MB, 264x204) Thumbnail displayed, click image for full size. 2075656
Hey niggas i got this integral here: dx/((radx)(x+1))
some help setting up the trig sub would be greatly appreciated.
Cornelius Dartman - Wed, 08 Oct 2014 10:22:23 EST ID:Gw2IN3ba No.14412 Ignore Report Quick Reply
You need to perform two substitutions. First use x = sin^2(u). Then use v = sin(u).
Cornelius Dartman - Wed, 08 Oct 2014 10:38:17 EST ID:Gw2IN3ba No.14413 Ignore Report Quick Reply
Wait, scratch that. Just use x = u^2. The end result has inverse trigonometric form, but the substitution doesn't need to be trigonometric.

Relearning math by Wesley Blatherson - Wed, 10 Sep 2014 08:12:53 EST ID:D/oQWr2Y No.14356 Ignore Report Reply Quick Reply
File: 1410351173283.jpg -(82220B / 80.29KB, 504x470) Thumbnail displayed, click image for full size. 82220
I've always been naturally bad at math, I failed algebra 2 twice in highschool because I just couldn't grasp the concepts fast enough. My sister who's a freshman in highschool asked me to help her with her homework, and I didn't know JACK SHIT.

I'm 20 and going to community college for a few courses while I work this upcoming spring, I don't plan to take math right away but is there some sort of program/books that will let me relearn math right from the beginning?
3 posts and 2 images omitted. Click Reply to view.
Hannah Penningcocke - Fri, 19 Sep 2014 11:15:59 EST ID:AJrEUkAQ No.14369 Ignore Report Quick Reply
I would love to help you with basic algebra/algebra 2!! I highly suggest taking math from the beginning, as you have quite a few semesters to make up to college-level courses if you're starting from the beginning. If you still won't do that, I suggest taking some time and learning some stuff on your own. http://khanacademy.com/ is an amazing resource; it's interactive, polished, and familiarizing yourself with stuff there will prepare you for doing mathematics on a computer, which you probably haven't done much since you haven't done math since high school.
Archie Goodman - Wed, 24 Sep 2014 13:12:32 EST ID:a8Tw8LvY No.14378 Ignore Report Quick Reply
>failed algebra 2 twice
I did 3 times, mostly because 2nd semester of algebra 2 is kinda bullshit. Now I'm in 3rd year engineering and I did Calc 3 a year ago
Rebecca Chorringfuck - Fri, 03 Oct 2014 11:45:44 EST ID:Z+iZvwQ7 No.14405 Ignore Report Quick Reply
Any site for physics? I'm taking capacitors and shit like that, electricity and magnetism. Need a good website for this stuff, preferably video. Youtube and khanacademy are insufficient.
Hedda Charringville - Fri, 03 Oct 2014 17:08:10 EST ID:V2nhYpJ2 No.14407 Ignore Report Quick Reply
MIT lectures
Might or might not be the correct section of the site, but if your answer cannot be found here you are either not looking close enough or undestanding it's in front of you.
Clara Crebblechodging - Fri, 03 Oct 2014 17:26:19 EST ID:xvgqavvT No.14408 Ignore Report Quick Reply
Re-learning math:

1) Lial's Basic College Math

This covers Kindergarten - Algebra. All the editions are the same so pirate/buy any of them.

2) Serge Lang's "Basic Mathematics" is great and will cover all you need to go into a rigorous theory based college math class. http://www.amazon.com/Basic-Mathematics-Serge-Lang/dp/0387967877/ref=sr_1_1?ie=UTF8&qid=1412284774&sr=8-1&keywords=serge+langs+basic+mathematics

There's also "No Bullshit Math" which does the same as Serge's book: http://minireference.com/ and Sheldon Axler's "Precalculus" which does the same.

I liked Serge's book. It's written by a Mathematician who doesn't hand hold or do anything else except teach you basic math from an advanced standpoint.. so you learn proper terms of everything and actually understand wtf is going on.

For Calculus I did MIT OpenCourseware 18.01 (Single) and 18.02 (Multi). There are no books, just lectures and assignments. After I did them I wanted to explore proofs more so did 18.014 and 18.024 (Both on the open courseware site). Basically all it consists of is doing a rigorous Calc book where you do a lot of proofs. I did them all in Scheme (because I was also trying to learn how to code). http://ocw.mit.edu/courses/mathematics/18-014-calculus-with-theory-fall-2010/ contains course notes by Munkres!! Awesome.
Comment too long. Click here to view the full text.

negative binomial help by Clara Fubblewill - Fri, 03 Oct 2014 15:03:16 EST ID:Aql4bjnf No.14406 Ignore Report Reply Quick Reply
File: 1412362996183.png -(3140B / 3.07KB, 458x381) Thumbnail displayed, click image for full size. 3140
I'm trying to get the variance for hypergeometric discrete random variable without using the moment generating function and am having a lot of trouble.. I started with V(X)= E(X^2) - E(X)^2 and can get E(X)^2 but can't get E(X^2). Then someone suggested I try E(X(X+1)) but I don't understand how to do that.... Any help?

Clarification on velocity vector and acceleration by Fanny Nendlefetch - Mon, 29 Sep 2014 17:57:44 EST ID:dfurG/DB No.14392 Ignore Report Reply Quick Reply
File: 1412027864973.gif -(426031B / 416.05KB, 667x488) Thumbnail displayed, click image for full size. 426031
The problem is below; what my question is, is do I need to know t or what? If I don't, then what do I do and if I do need it, how do I find it?

At a certain moment, a particle moving along a path has a velocity v=<3,2,1> and a=<0,5,2>. Find T, N and the decomposition of a into tangential and normal components.

If I had a parametrized function for v I'd be good, but I don't because I don't know t...
Any help?
Fanny Nendlefetch - Mon, 29 Sep 2014 19:38:38 EST ID:dfurG/DB No.14393 Ignore Report Quick Reply
fac u op
Nell Foshfield - Wed, 01 Oct 2014 06:50:01 EST ID:Gw2IN3ba No.14402 Ignore Report Quick Reply
If by t you mean time, they don't provide that information and there is no way to deduce it. T here is kinetic energy and N is the normal force, yes? All you need to find T is the velocity and the mass (I assume the mass was provided earlier). Because the velocity must be tangential to the path at the point under consideration, you can use this to find the tangential and normal components of a. And the normal force is just the normal component of a scaled by m.
John Fendernidge - Wed, 01 Oct 2014 22:27:34 EST ID:kDYSaBHq No.14404 Ignore Report Quick Reply
To find tangential acceleration just project the a vector onto v

a_tan = a dot v/||v||

Then a_norm = a - a_tan

yay math

Help, what the fuck is P? by Fuck Donningdale - Thu, 25 Sep 2014 01:46:11 EST ID:aQ2ap22j No.14379 Ignore Report Reply Quick Reply
File: 1411623971598.png -(17447B / 17.04KB, 753x627) Thumbnail displayed, click image for full size. 17447
How do I solve these?
Or what are the solutions?
3 posts omitted. Click Reply to view.
Lydia Pengerwone - Sun, 28 Sep 2014 17:55:22 EST ID:V2nhYpJ2 No.14390 Ignore Report Quick Reply
Actually because the function and boundaries are linear, the minima & maxima are at the intersections.
Lydia Pengerwone - Sun, 28 Sep 2014 17:58:00 EST ID:V2nhYpJ2 No.14391 Ignore Report Quick Reply
No wait, it can't be.
P = 10 - x - y;
f = { -10 < x < 10; -10 < y < 10 }
So what are the actual criteria for the minima & maxima being at the boundary and/or the intersections?
Martha Donkinherk - Mon, 29 Sep 2014 23:01:21 EST ID:umZ//85N No.14394 Ignore Report Quick Reply
1st one,
x-y <=4

use above two equations, solve for y
y<= 6 - x
y >= x - 4
y>= 0
since x <=5, and x-4 <= y, then the maximum of y is 1, thus we know
0<= y <= 1
at this point i think x is unbounded, meaning that P has no minima
but the maximum is x = 5 and y - 1 so Max P = 20
Martha Donkinherk - Tue, 30 Sep 2014 00:07:18 EST ID:umZ//85N No.14396 Ignore Report Quick Reply
never mind im retarded this isnt right
John Fendernidge - Wed, 01 Oct 2014 22:24:51 EST ID:kDYSaBHq No.14403 Ignore Report Quick Reply
lol you were right the first time. For your example the maximum is at one of the corners, x=y=-10

Linear Algebra and Matrices by Lillian Druddledone - Mon, 29 Sep 2014 23:56:43 EST ID:wV5uRW/L No.14395 Ignore Report Reply Quick Reply
File: 1412049403600.jpg -(19820B / 19.36KB, 378x246) Thumbnail displayed, click image for full size. 19820
Hey guys, first post in /math/, hope you guys can help me out. Right now in Linear Algebra we're working with matrices (no surprises there) and I'm pretty confused on how to even begin solving this problem. We just recently learned about inverse matrices, transposed matrices, and matrix multiplication. Appreciate any guidance.
Barnaby Lighthood - Tue, 30 Sep 2014 02:06:20 EST ID:V2nhYpJ2 No.14397 Ignore Report Quick Reply
Consider, how would you solve
2x + 4 = 7x
The same holds here.
Lillian Druddledone - Tue, 30 Sep 2014 14:51:18 EST ID:wV5uRW/L No.14400 Ignore Report Quick Reply
Thanks for the tip, but I feel like matrices act differently. So I want to put the X's on the same side, but can I add/subtract the two matrices together?
Samuel Windledat - Tue, 30 Sep 2014 20:27:49 EST ID:V2nhYpJ2 No.14401 Ignore Report Quick Reply
IIRC that property is called distributivy and that should hold with matrix multiplication. Or I might be wrong.
driven !FTPgBqDDy. - Sat, 04 Oct 2014 23:07:55 EST ID:MSWrPT9p No.14409 Ignore Report Quick Reply
OP you need to group the X terms on one side, find the inverse of the matrix multiplying X (there is a formula for 2x2 matrix inverse), and then multiply both sides by the inverse yielding X = somematrix.

'cos a matrix multiplied by its inverse is the identity matrix.
and the identity matrix times X is just X, it's 1 in matrix terms.

What does this mesn? by Emma Bobberforth - Tue, 30 Sep 2014 10:01:26 EST ID:Vib06tOc No.14398 Ignore Report Reply Quick Reply
File: 1412085686890.png -(4902B / 4.79KB, 389x248) Thumbnail displayed, click image for full size. 4902
Wesley Huffingbanks - Tue, 30 Sep 2014 10:34:08 EST ID:aO+d5dci No.14399 Ignore Report Quick Reply
first equation is called the gaussian integral, it's basically that the area under the curve y = exp(-x^2) is the square root of pi.

second equation is the fourier series of f(x), this is basically saying that you can write the function f as a infinite sum of sines and cosines.

last equation is the quadratic formula, it gives the solutions of ax^2+bx+c=0 , where a,b,c are real numbers.

favorite and least favorite math stuff by Albert Cullerville - Fri, 22 Aug 2014 05:21:14 EST ID:Z8nJxYf6 No.14298 Ignore Report Reply Quick Reply
File: 1408699274913.jpg -(79045B / 77.19KB, 510x310) Thumbnail displayed, click image for full size. 79045
What's your favorite math subject? and your least favorite?

I'm taking a re-exam for one of my math classes (4th time I do this shit), and it's some basic billiondimensional stuff, you know the kind. Anyway, I love the lagrange multiplier stuff, and the stuff that can be expressed equally as an analisys problam as well as a linear algebra problem. But those fucking integrals!
It's just so fucking tedious. We're even allowed to use maple for the full duration of the exam, and still; Bweeurg!

But discrete maths, that's fucking delightful! Galois fields and stuff, waw! Also, probability theory has some really cool proofs and results, too bad I only have 2 classes on it.
5 posts omitted. Click Reply to view.
Oliver Pecklemitch - Thu, 11 Sep 2014 13:54:08 EST ID:douj37yb No.14358 Ignore Report Quick Reply
Thx amigo. I'm not too worried about my future.
Wesley Nicklebury - Sun, 14 Sep 2014 15:32:25 EST ID:TUe0P9ii No.14366 Ignore Report Quick Reply
Favorite is Geometry. Least favorite is matrices.
Hannah Penningcocke - Fri, 19 Sep 2014 11:12:36 EST ID:AJrEUkAQ No.14368 Ignore Report Quick Reply
1411139556215.png -(179035B / 174.84KB, 318x324) Thumbnail displayed, click image for full size.
I loved geometry. I wish I remembered all of those damn theorems and postulates I learned as a freshman in high school. Alas, I dropped out and forgot 80% of them. Regaining my math knowledge, though!

I'm not sure what I dislike the most. I'm still a math babby.
Sophie Gicklestock - Sat, 27 Sep 2014 09:02:36 EST ID:vsyqzWjr No.14384 Ignore Report Quick Reply
Graph Theory and Abstract Algebra are my favorites. My least favorite might be Real Analysis? It's all super useful and interesting stuff in its own special kind of way, but can be tedious and not fun to write proofs.
Nigger Congerchuck - Sat, 27 Sep 2014 13:19:49 EST ID:V2nhYpJ2 No.14385 Ignore Report Quick Reply
Favourite thing I've been taught in math courses would likely be probabilites.
3D geometry in game design was fun too. Maybe the most interesting (and most 'mathy') stuff was in modelling parallel programs with composed state machines.

slope wtf by Oliver Hellyman - Mon, 22 Sep 2014 04:33:46 EST ID:qmsb2zs3 No.14375 Ignore Report Reply Quick Reply
File: 1411374826804.png -(9798B / 9.57KB, 241x167) Thumbnail displayed, click image for full size. 9798
I have no idea what I'm doing here. The problem says "Find the slope of the line containing the given points" All examples in the book are completely different. The answer to 27 is 5, but I have no idea why. How do I do these problems?
Oliver Hellyman - Mon, 22 Sep 2014 04:44:25 EST ID:qmsb2zs3 No.14376 Ignore Report Quick Reply
shit I'm retarded they're ordered pairs


Proofs are the shit by Whitey Fillyleg - Fri, 12 Sep 2014 20:51:34 EST ID:TrfloaeP No.14361 Ignore Report Reply Quick Reply
File: 1410569494767.jpg -(65377B / 63.84KB, 620x468) Thumbnail displayed, click image for full size. 65377
Sup guys. I'm a couple weeks into my first MATH class that is based around proofs and it turns out I'm fucking awesome at this type of thing. I had a very difficult time learning Cal2 and Cal3 because of poor quality of previous education, other factors, etc.

So, my question to you guys is, what do the people that are naturals when it comes to the formal proof methodology of thinking do? What kind of career should I be focused on, and what are other classes that are similar to this type of thing? I know it will depend on university wrt names of classes, but I have heard Modern Algebra is one of them and Real Analysis is another.

I'm also interested in "Set Theory", but do not know where to start or if/how it relates to proofs.. Thanks.
Fucking Badgestone - Sat, 13 Sep 2014 00:26:31 EST ID:Hs5ANTy/ No.14363 Ignore Report Quick Reply
I don't have the energy to rant to you about what constitutes good mathematics right now, but math is basically all about defining things and then proving things about them. If you really like this stuff, consider becoming a mathematician.
Molly Sacklestotch - Sat, 13 Sep 2014 19:01:40 EST ID:VWxuWxBu No.14365 Ignore Report Quick Reply
If you *really* like proofs (and want to learn about formal proofs), than you should take logic and set theory (although it is possible to like logic and not set theory)

Should I be a numerologist? by Eliza Fammerlere - Thu, 28 Aug 2014 00:14:38 EST ID:NE+OsI8C No.14331 Ignore Report Reply Quick Reply
File: 1409199278216.jpg -(214894B / 209.86KB, 1003x1400) Thumbnail displayed, click image for full size. 214894
I look at math equations and I read aloud what pertains to the universe (1 and or/2 [in the future which is the past])

I just write out simple math equations


1+1 = life, 2=life with god, 2+2 = universal communication. and there are many more outcomes, simply one for each individual for those simple equations.

Its like I can peer into the soul of other people with math.

Lately, my math equation of my life = 2+2=5 (1 being innate, the universe) waiting for it to become 2+2=6. (when 1+1 (FOR HOW DOES ONE BECOME TWO WITHOUT BEING ONE ITSELF) becomes the new innate and we shift into the next predestination by means of a new god)

More info on 2+2=5 is I died, saw the universe, deemed everythings plural, thus attempting to recreate my lifes equation into 2+2=6.
Comment too long. Click here to view the full text.
6 posts omitted. Click Reply to view.
Hedda Piddlehodge - Mon, 01 Sep 2014 18:08:50 EST ID:7smvO3L9 No.14342 Ignore Report Quick Reply
okay, i follow you, but where do hypperreals fit in
Ebenezer Febberstod - Wed, 03 Sep 2014 00:20:31 EST ID:Dk8yywxc No.14346 Ignore Report Quick Reply

The hyperreals fill in the gaps between the meanings we can express and the ones we can't. Everything is continuous, but our finite minds can only approximate with the discrete. While we're in 2+2=4 our experiences will point outside of it, leading to the intuition that infinite small quantities exist wedged within the cracks of our existence. It is just as true but we cannot touch it without transcending to beyond 6, into an inaccessible singular quantum that cannot be even expressed in this frame. From the regular reals, we add all these quantums to get the hyperreals.

Essentially they're between the kinks. x-19y = 404z^2/9
Clara Gemblewill - Thu, 04 Sep 2014 01:57:37 EST ID:qt5i3eqa No.14348 Ignore Report Quick Reply
Are you Doctor? From /psy/? You are aren't you? Your schizophrenic ramblings are structured exactly like Doctor's were.
Lillian Crellerbutch - Fri, 05 Sep 2014 00:45:33 EST ID:gzRif05L No.14349 Ignore Report Quick Reply
1409892333868.gif -(3040265B / 2.90MB, 200x170) Thumbnail displayed, click image for full size.

>Should I be a numerologist?

Sure. Be a numerologist.
But see a psychiatrist.

The delusions you're posting here seem pretty harmless, but you need to be monitored in case they turn into something that will cause you to harm yourself.
Henry Momblewetch - Wed, 10 Sep 2014 13:54:16 EST ID:8Zy6ydRZ No.14357 Ignore Report Quick Reply
ur doing it wrong though OP & making me cringe a bit

At least study the history of numerology, sacred geometry, & alchemy. Listen to some Manly P Hall history lectures.

see you on /spooky/

<<Last Pages Next>>
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Report Post
Please be descriptive with report notes,
this helps staff resolve issues quicker.