420chan now has a web-based IRC client available, right here
Leave these fields empty (spam trap):
Name
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
Subject
Comment
[*]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
File

Sandwich


Community Updates

420chan now supports HTTPS! If you find any issues, you may report them in this thread
I'm an autistic by Sophie Crovingspear - Sun, 05 Nov 2017 03:47:19 EST ID:aO21Ekyq No.15577 Ignore Report Reply Quick Reply
File: 1509871639668.png -(1048491B / 1023.92KB, 651x618) Thumbnail displayed, click image for full size. 1048491
I am taking a class in abstract algebra and was getting ready for a test and noticed a pattern that has popped up when shows how to represent all polynomial functions in a ring that map from Zmodn to Zmodn. What I (think) I found is pretty much why when you have some value x^n it can be replaced with x etc. Pretty much showing why there is only one way to represent all the functions withing the ring due to not being able to have any x raised to something larger than n-1
>>
Reuben Drucklenire - Sun, 05 Nov 2017 16:13:48 EST ID:pjkjVzRP No.15578 Ignore Report Quick Reply
https://en.wikipedia.org/wiki/Fermat's_little_theorem

Also, if n=4 then 2^4=16=0 but 0 is not 2. You can only do your trick when k and phi(n) are coprime.


Oh fuck. by Poor faggot - Sun, 10 Sep 2017 05:38:52 EST ID:8UKf4f6U No.15559 Ignore Report Reply Quick Reply
File: 1505036332760.jpg -(1849091B / 1.76MB, 3264x2448) Thumbnail displayed, click image for full size. 1849091
Just entered college and put my major down as math.
I haven't fucking done math in years. I dropped out! I fucking dropped out because I thought fuck high school, college is where its at. Now I'm fucking here and i have no clue what I'm doing.
Tips?
Picture is a latern I stole from a meth-head while he was in jail. Its my finest decoration in my dorm.
1 posts omitted. Click Reply to view.
>>
.... - Sat, 23 Sep 2017 14:52:29 EST ID:hw7QDM7l No.15568 Ignore Report Quick Reply
1506192749426.jpg -(107796B / 105.27KB, 965x827) Thumbnail displayed, click image for full size.
you can just change your major and if your college offers free tutoring sessions then i suggest you take it until you have a firm understanding of whatever it is your trying to learn
>>
Phyllis Bonderdock - Sat, 23 Sep 2017 21:02:36 EST ID:GW5uULCD No.15569 Ignore Report Quick Reply
sounds hard better quit
>>
James Fuckingspear - Sun, 24 Sep 2017 16:33:03 EST ID:lYjTKStM No.15570 Ignore Report Quick Reply
As somebody who dropped out of studying math after 3 months, don't sweat it.

That said high school math is very different to academic math. You won't be learning calculus or algebra, at least not at the uni.
However you learn about proofs, what you need them for different kinds of proofs and how they are done. You'll need some algebra to follow the exercises and examples, but nothing really substantial.
But you might discover that Math in it's academic form is an ivory tower and if you want to do anything but being a researcher you'd have to find your own interests to do something financially worthwhile in life, which will be if you really like math seem stale in comparison.

If you want to learn something exciting that relates to the real world get out asap.
>>
James Fuckingspear - Sun, 24 Sep 2017 16:37:19 EST ID:lYjTKStM No.15571 Ignore Report Quick Reply
Not that math isn't exciting, it's the most powerful science in existence. But you need to be pretty smart to archive something in it. (By that I mean coming up with a new conjecture or proving a theorem)
>>
Jack Soddleson - Mon, 25 Sep 2017 03:37:41 EST ID:+lsSrhgb No.15572 Ignore Report Quick Reply
>>15570

An undergraduate degree in math almost always requires taking a sequence of calculus classes that lead in to proof based math. There are many people that get undergraduate degrees in mathematics that go on to work in the private sector successfully. It is inaccurate to say it's in ivory tower field, that is only accurate if you want to become a professional math researcher, which even a large portion of those with math doctorates don't pursue after their thesis.

OP if you're interested in math stick with it. There are jobs out there for people with math aptitude. You will probably have to learn how to program.

Math related jobs are high satisfaction because they generally pay decently and the process of learning various fields of mathematics can be really mentally rewarding depending on your personality.

On the other hand, if you want a more streamlined career progression that follows a pipeline you may want to choose a more professional style of program. If you study math and don't want to become the ivory tower researcher, at some point there is a transition you have to make in to doing real world things that causes even the most intelligent people to "fall off the wagon" sometimes.


Pleb Contemplates Curvature by Pleb - Mon, 23 May 2016 14:22:48 EST ID:BB0KLoxX No.15128 Ignore Report Reply Quick Reply
File: 1464027768468.png -(150891B / 147.35KB, 769x595) Thumbnail displayed, click image for full size. 150891
I am certain i am missing information so i appeal to you brainy smarties to educate me However this also may be a physics questions. I dunno.

Do curves actually exist? Meaning at the smallest point possible (I would assume planck length) would it not be a straight line from point A to point B then a second straight line from point B to point C etc etc? Only upon pulling back far enough to no longer see the individual points does the curve appear?
34 posts and 4 images omitted. Click Reply to view.
>>
David Sobberford - Tue, 12 Sep 2017 20:56:49 EST ID:KoXeDG6b No.15562 Ignore Report Quick Reply
I'm pretty distraught to see people trying to answer a mathematics question with physics.
To answer OP's question:
In mathematics, yes curves exist all the time.
In physics, depends which physicist you ask.
>>
Wesley Crecklebot - Thu, 14 Sep 2017 23:14:27 EST ID:kSqLGZD/ No.15563 Ignore Report Quick Reply
>>15562

The reason that people do math is that there is some hope it corresponds to reality... The issue is whether the mathematical reality corresponds to what is "out there"
>>
Graham Bennernotch - Fri, 22 Sep 2017 18:49:55 EST ID:F95jr/F4 No.15565 Ignore Report Quick Reply
>>15505
Any model of reality discussed in language is "sort of" discrete because language is a discrete medium. However, to the extent that language can describe the idea of continuity at all, it can also encode it in a model of reality, so there is no comprehensible sort of continuousness which cannot also be a property of the Universe. As such it makes no sense to argue that the Universe is discrete because the models are discrete, because "the models are discrete" is not a meaningful statement: all possible models are discrete because the means of communicating them is discrete. Effectively the argument becomes that no continuous universe could contain beings which communicate about said universe in a discrete language, which is clearly silly.
>>
Graham Bennernotch - Fri, 22 Sep 2017 18:53:45 EST ID:F95jr/F4 No.15566 Ignore Report Quick Reply
>>15565
But the setting for qft is R^n (and also C^n) and uses the axioms of real fields which are the "best" mathematical expression of continuity known. If that's not a continuous universe then it isn't possible to talk rigorously about what is
>>
Hannah Bardshaw - Sat, 23 Sep 2017 08:29:57 EST ID:lYjTKStM No.15567 Ignore Report Quick Reply
>>15565
Calculus is an excellent "language" to describe a continuous real world property.


Getting into Physics ---> Quantum stuff by Beatrice Sepperhall - Thu, 21 Aug 2014 13:14:21 EST ID:t/8wjLF3 No.14296 Ignore Report Reply Quick Reply
File: 1408641261077.jpg -(125896B / 122.95KB, 1200x930) Thumbnail displayed, click image for full size. 125896
Where should I start? Should I learn a bunch of calculus first? I was recommended University Physics With Modern Physics (Young & Freedman) to start with and then to move to Quantum Mechanics (Bransden & Joachain). At least to start off with.

Any other recommendations or whatever? Besides college and stuff, just on maybe the order you began learning it or w/e? thanks.
5 posts omitted. Click Reply to view.
>>
Hamilton Docklekane - Tue, 02 Sep 2014 22:21:50 EST ID:n1HpAHmU No.14344 Ignore Report Quick Reply
>>14341
I personally think the study of differential equations is more important to have down before the linear algebra when learning the basics of QM, because then you can get a feel for what Shrodinger's equation is saying, but there is much debate on the proper pedagogy for teaching it. Vibrations and Waves by French is my personal choice for learning diff eq.s and linear algebra/ their applications to physics all in one nice bundle. Also Mathematical Methods in the Physical Sciences by Boas has been a life saver for soooo many areas in physics. I still keep my copy of it from sophomore year in college on my bookshelf.
>>
Archie Worthingfield - Sun, 07 Sep 2014 18:26:47 EST ID:xvgqavvT No.14354 Ignore Report Quick Reply
Here ya go, a full list of exactly what you need to be a good theoretical physicist
http://www.staff.science.uu.nl/~Gadda001/goodtheorist/index.html

Many of the links don't work anymore, so substitute with MIT Open Courseware lectures on Math/Physics or whatever modern books you can find. http://ocw.mit.edu/courses/physics/8-05-quantum-physics-ii-fall-2013/video-lectures/
>>
Barnaby Brellyhick - Sat, 20 May 2017 21:48:22 EST ID:EJeHrwkJ No.15507 Ignore Report Quick Reply
>>14296
Write a paper suggesting a link between chemistry and physics
>>
Martin Murdman - Mon, 19 Jun 2017 22:10:21 EST ID:q/daWEW+ No.15522 Ignore Report Quick Reply
>>14296
Learn calculus, differential equations, linear algebra, and abstract algebra/group theory. Read Quantum Mechanics by Shankar. When they start about euler lagrange equations as a way of doing classical mechanics problems check out Give Taylor's Classical Mechanics.

If you want to go deep the Landau Lifshitz books are essential. Griffith has a good E&M book if you are only interested in learning enough E&M to do advanced quantum. Gordon Baymn's lectures on quantum are really dense, but really well summarize the most essential aspects of quantum, and teach you how to solve some really practical problems (spectroscopy/scatter/super conductivity class shit). Messiah's and Sakurai's textbooks are each good in their own ways.

take acid
>>
Jack Brookham - Sat, 26 Aug 2017 12:25:01 EST ID:wgTUzquz No.15552 Ignore Report Quick Reply
You need calc 1 and maybe calc 2 (techniques of integration) for undergrad level physics books (specifically Newtonian mechanics and Electromagnetism). I used University Physics which you mention and Fundementals of Physics by Halliday and Resnick, either will do (get an old edition for cheap) but I personally liked University Physics more.

As for QM you'll need linear algebra and differential equations, both of which you should study after calculus. I'd recommend getting an old edition of Calculus by Stewart, Spivak might be too much if you've never seen calculus or if your algebra and trig is weak. Undergrad math textbooks are generally shitty money grabs, and MIT has some of their's up for free.

For other book suggestions I'd recommend looking at a university's physics courses and their respective syllabi.


Physics. Forces. Springs. by Cyril Nucklepodging - Sun, 16 Jul 2017 10:24:40 EST ID:tgwdoW8d No.15535 Ignore Report Reply Quick Reply
File: 1500215080231.png -(16883B / 16.49KB, 973x331) Thumbnail displayed, click image for full size. 16883
Does it matter what ordeer 2 springs are in, if youre stacking them and measuring the total force?
>>
Esther Dartfield - Thu, 20 Jul 2017 19:06:29 EST ID:A2j/BW/W No.15541 Ignore Report Quick Reply
no


Math Problems you came up with by Charles Fundlepeck - Thu, 22 Jun 2017 16:37:54 EST ID:jadYTFeE No.15524 Ignore Report Reply Quick Reply
File: 1498163874635.gif -(2096042B / 2.00MB, 338x252) Thumbnail displayed, click image for full size. 2096042
A rectangular piece of cardboard has a length that is twice its width. Squares with sides that measure 1/10 of the length of the cardboard are cut from each corner and the resulting flaps of the cardboard are turned up to form an open box. A maximum of 24 cubes that measure 2 inches on the sides can fit perfectly inside the box. What are the dimensions of the box? What were the length and width of the rectangular cardboard before it was cut and made into a box?
2 posts omitted. Click Reply to view.
>>
James Gembleford - Thu, 22 Jun 2017 21:09:11 EST ID:j58znr37 No.15527 Ignore Report Quick Reply
>>15526
The number I gave before is close to 11. I checked and unless this is a rounding issue I'm either right or setting up the problem incorrectly.
>>
Betsy Cenderhall - Thu, 22 Jun 2017 21:12:25 EST ID:jadYTFeE No.15528 Ignore Report Quick Reply
>>15527
I think you're setting the problem incorrectly. Here's a hint: The width consists of just two digits.
>>
James Gembleford - Thu, 22 Jun 2017 23:49:39 EST ID:j58znr37 No.15529 Ignore Report Quick Reply
>>15528
Oh I was doing squares which are 1/10 the width of the cardboard, not the length.
>>
James Gembleford - Fri, 23 Jun 2017 10:43:03 EST ID:j58znr37 No.15530 Ignore Report Quick Reply
So I now realise that my other answer doesn't really make sense because the resulting box would be the right volume to contain the cubes but not the right height. With that in mind, the solution is easy. Let x be the width of the original cardboard. The length is then 2x and the side length of the squares removed is (1/10)2x=(1/5)x. But this number becomes the height of our box, which must be 2in if the cubes are to fit perfectly inside. Solving (1/5)x=2in we find the width can only be 10in and the length 20in.
>>
Betsy Cenderhall - Fri, 23 Jun 2017 10:54:59 EST ID:jadYTFeE No.15531 Ignore Report Quick Reply
>>15530
Congrats, you got it! I hope others here had fun with my little problem.


Star by Black Hole Son - Thu, 01 Jun 2017 18:14:15 EST ID:Mfduv5of No.15517 Ignore Report Reply Quick Reply
File: 1496355255705.jpg -(92361B / 90.20KB, 960x918) Thumbnail displayed, click image for full size. 92361
How do you determine the quantity of a thing mixed up in other things to a point where the sum total gets blurred by the myriad factors of an æquation?
>>
John Cannerway - Fri, 02 Jun 2017 14:34:58 EST ID:BI+jncva No.15520 Ignore Report Quick Reply
Try stating your question more clearly, if possible. It sounds more like you're not able to determine the quality of that thing because your definition of what thing is lacks the enough specificity for you to even know where to start when trying to extract the appropriate information from where and in what ways to manipulate it to give you a quantity for the exact thing it is you are trying to determine the quantity of.


Best language for math by Simon Sattingbury - Wed, 22 Mar 2017 03:37:13 EST ID:lwS34rUW No.15429 Ignore Report Reply Quick Reply
File: 1490168233477.jpg -(75572B / 73.80KB, 620x1014) Thumbnail displayed, click image for full size. 75572
German?
3 posts omitted. Click Reply to view.
>>
Phineas Chacklestetch - Sun, 09 Apr 2017 02:12:13 EST ID:vrOFV9fT No.15460 Ignore Report Quick Reply
>>15429

I want to add that some German words are things that would be lengthy phrases in english. For instance a famous theorem is Hilbert's Nullstellensatz theorem, which roughly and shittily translated in to english means the zeroes places theorem.

German isn't a better language for math, because mathematical objects are independent of language.
>>
James Sinkinbitch - Sun, 09 Apr 2017 17:24:13 EST ID:6m87/9/+ No.15467 Ignore Report Quick Reply
>>15459
I do agree, but I also think that sometimes language gets in the way of learning.

for instance, closed/open/clopen in topology (using words which have binary meaning to talk about objects which arent binary)

or 'imaginary' numbers

Those things arent hurdles for math people, but I do think they are hurdles when someone is trying to learn math
>>
Fucking Crocklemack - Thu, 13 Apr 2017 22:08:40 EST ID:c0vo/Lfo No.15471 Ignore Report Quick Reply
>>15460
It takes roughly as long to say Nullstellensatz as it does to say Zeros Places Theorem. All that German accomplishes is reducing the number of spaces you have to type.
>>
Thomas Pammerdale - Sat, 20 May 2017 21:41:47 EST ID:1puAuUud No.15506 Ignore Report Quick Reply
>>15429
The lost language of babbaganoosh
>>
John Bliffingson - Wed, 24 May 2017 03:05:51 EST ID:lub1zF0h No.15512 Ignore Report Quick Reply
>>15471

Yes, but there are fewer "z" letters in Zero Places Theorem, and the space key is already one of the most used buttons. It is more economic and eco-friendly over the long run to use long and complicated words that have lots of "z" and 15+ characters.


Mandlebrot Set Via WEbcam Iteration Discoved By Me by Eric Alan Frazin - Sun, 14 May 2017 03:01:43 EST ID:Cv411eOF No.15498 Ignore Report Reply Quick Reply
File: 1494745303297.png -(157083B / 153.40KB, 1366x768) Thumbnail displayed, click image for full size. 157083
<center>
<body bgcolor="black" onmousemove="drawe();">
<video id="video" autoplay hidden height="500" width="500"></video>
<canvas id="canvas" width="500" height="500" style="">
<script>
var ii=177;
var video = document.getElementById("video");
var c = document.getElementById("canvas");33
var ctx = c.getContext("2d");
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var text = "";
var video = document.getElementById('video');
var mediaConfig = { video: true,audio:true};
function drawe(){
Comment too long. Click here to view the full text.
>>
Eric Alan Frazin - Sun, 14 May 2017 03:05:21 EST ID:Cv411eOF No.15499 Ignore Report Quick Reply
I know double posted in prog but this is a break through in physics, math and comp sci.
>>
Eric Alan Frazin - Sun, 14 May 2017 03:12:08 EST ID:Cv411eOF No.15500 Ignore Report Quick Reply
<style>

canvas{
filter:contrast(4038%);



}
</style>
<center>
<canvas id="canvas" width='1500' height='1500'></canvas>

<body bgcolor="black" onmousemove="drawe" onmousedown="drawe" onchange="drawe" ondoubleclick="drawe;">
<video id="video" autoplay hidden>
</video>
Comment too long. Click here to view the full text.
>>
Phoebe Tillingstone - Mon, 15 May 2017 00:40:31 EST ID:AQ7xCSUt No.15501 Ignore Report Quick Reply
it's a neat little app. can you explain the principals behind it?
>>
Archie Blimmerfuck - Thu, 18 May 2017 01:12:57 EST ID:j58znr37 No.15502 Ignore Report Quick Reply
>>15501
It's autism combined with a severe lack of moderation on the academic boards.


Linear Algebra Review by Alice Finkinman - Mon, 27 Apr 2015 02:23:31 EST ID:AOEV1QdK No.14706 Ignore Report Reply Quick Reply
File: 1430115811548.jpg -(75522B / 73.75KB, 600x763) Thumbnail displayed, click image for full size. 75522
I took a linear algebra class years ago and want to review. I have Axler's Linear Algebra Done Right and really enjoy it, but I want something with more applications and exercises to go along with it.

Suggestions? Online or texts
1 posts omitted. Click Reply to view.
>>
Reuben Chacklefield - Sun, 17 May 2015 07:09:03 EST ID:WtAxPZi7 No.14735 Ignore Report Quick Reply
Gilbert Strang is pretty cool, he teaches Linear Algebra. Here's the playlist for all his lectures: https://www.youtube.com/watch?v=ZK3O402wf1c&list=PL41A1C92F1766D4AB
>>
Shit Subberfoot - Fri, 29 May 2015 04:55:00 EST ID:HKah9GEZ No.14760 Ignore Report Quick Reply
If you really want to go deep inside Linear Algebra I suggest you study a little of Abstract Algebra. I used Fraleigh, it's a good book, you can find it online as a .pdf. With Abstract Algebra you will gain a deep knowledge about algebraic structures, such as groups rings and fields (as well as he other intermediate structures), and trust me Linear Algebra will become clearer. After that you will be able to go deeper into whatever you want, for instance Non-Linear Algebra or Group theory.
>>
Fuck Chorryford - Fri, 29 May 2015 10:00:06 EST ID:/JY7Oqfv No.14761 Ignore Report Quick Reply
Linear Algebra by Shilov
>>
Esther Binderford - Sat, 30 May 2015 12:40:05 EST ID:V731xQnT No.14763 Ignore Report Quick Reply
>>14707
Lax is the one I just used for my class this spring. Pretty good book, easy if you have a basic understanding and use it in cojucntion with internet tutorials to refresh. LOTS of practical uses for the material
>>
Hannah Blittinglit - Mon, 24 Apr 2017 21:48:51 EST ID:jVVag+L0 No.15489 Ignore Report Quick Reply
>>14706
work through every problem in linear algebra done
do some abstract algebra along the way
good luck


What is the theory of Equality by E - Thu, 20 Apr 2017 09:52:31 EST ID:LbDKCfts No.15477 Ignore Report Reply Quick Reply
File: 1492696351943.jpg -(6273B / 6.13KB, 231x206) Thumbnail displayed, click image for full size. 6273
I wrote this program the demonstrate my idea, http://faceclicker.com if it the wrong theory please discuss


What's your power level? by William Drenkingold - Thu, 01 Dec 2016 01:21:19 EST ID:I4oaqfW8 No.15281 Ignore Report Reply Quick Reply
File: 1480573279507.jpg -(72258B / 70.56KB, 300x567) Thumbnail displayed, click image for full size. 72258
I'm new to this site and it struck me as pleasantly surprising that there's a whole set of science&math boards. I am however rather skeptical about the average level of education here, so let's make a little survery:

  1. Age
  2. Degree
  3. Specialty
  4. Dream job/profession
  5. Plans for the near future and long term strategy
15 posts and 4 images omitted. Click Reply to view.
>>
John Drarrypon - Sun, 19 Mar 2017 15:09:40 EST ID:c0vo/Lfo No.15424 Ignore Report Quick Reply
>>15423
You shouldn't be paying for graduate school in anything technical. They should be paying you to teach and covering your tuition.
>>
Phineas Chacklestetch - Sun, 09 Apr 2017 02:31:07 EST ID:vrOFV9fT No.15462 Ignore Report Quick Reply
>>15285

I am at the end of an algebraic topology course right now, and my professor doesn't make much sense. I think I understand homology and cohomology pretty well, but spectral sequences have really fucked my brain. Since it's your area, do you think you can recommend a survey paper or something on it.

Other topics in algebraic topology have useful applications. Why should I give a shit about spectral sequences? Of course they are a generalization, but it seems it only has use for higher homotopy groups and etc.

Why should anyone outside of mathematics care about higher homotopy groups? They are notoriously difficult and at least to this day don't have the same applications that their homological counterparts enjoy.
>>
Phineas Chacklestetch - Sun, 09 Apr 2017 02:42:19 EST ID:vrOFV9fT No.15463 Ignore Report Quick Reply
>>15423
>>15424

This. If you get admitted you should get a teaching position with a survival wage. I am paid 20,000$ a year with tuition and health insurance free, and 100 students.

I could get more if I were to quit early and get a masters degree
>>
Fuck Billingfoot - Wed, 19 Apr 2017 19:41:06 EST ID:oXSM8l4D No.15476 Ignore Report Quick Reply
1492645266104.jpg -(114049B / 111.38KB, 595x397) Thumbnail displayed, click image for full size.
>>15281
  1. 25
  2. Finance
  3. Real-Estate Finance
  4. Professional Investor
  5. Having a hot wife that loves me and a large bank account.

I'd also like to point out that your inquiry means very little, as even the smartest of men at one point were nothing.
>>
Doris Bangershaw - Fri, 02 Jun 2017 03:11:28 EST ID:y3TGqPb4 No.15519 Ignore Report Quick Reply
>>15476

>Having a hot wife that loves me and a large bank account.

Women are incapable of love, except for themselves and their biological children.

If you have a sufficiently large bank account, however, you can easily convince one to pretend to love you. That's quite common.


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