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
Hey Neeeeerd by Alice Bleffingford - Sun, 23 Jul 2017 18:23:32 EST ID:n3nShEOS No.15542 Ignore Report Reply Quick Reply
File: 1500848612257.jpg -(59386B / 57.99KB, 580x407) Thumbnail displayed, click image for full size. 59386
Why do you post here? Wouldn't it be easier to go to a forum or something that is specifically created for mathematics discussion? Why do you post here and wait like 4 weeks for a reply from some stoned hippy when you can go somewhere else for quicker and more informed input?
5 posts and 1 images omitted. Click Reply to view.
>>
Phineas Turveyhood - Sat, 21 Oct 2017 02:58:05 EST ID:mDdoWUWV No.15574 Ignore Report Quick Reply
I respect hippies' input on math.
>>
Cornelius Pullermotch - Sun, 22 Oct 2017 21:27:56 EST ID:A8rh+RAv No.15575 Ignore Report Quick Reply
I post here for the same reason I do drugs with hippies and try to teach them about infinity.
>>
Priscilla Blucklewit - Fri, 10 Nov 2017 02:54:44 EST ID:m52FE4m4 No.15582 Ignore Report Quick Reply
>>15543
the other boards actually get traffic

i thought math nerds were supposed to be smart guess not LOL
>>
Hamilton Gacklebanks - Thu, 15 Feb 2018 07:54:31 EST ID:QvmnWvcn No.15608 Ignore Report Quick Reply
PORN.
>>
Ian Chemmleforth - Sun, 18 Feb 2018 17:09:36 EST ID:JCgRdXcX No.15610 Ignore Report Quick Reply
It should honestly be merged with some other STEM boards. It's dumb to have 50 boards with 4 posts/week instead of a few boards with healthy activity.


Statistics Question by Ian Chemmleforth - Sun, 18 Feb 2018 16:36:31 EST ID:JCgRdXcX No.15609 Ignore Report Reply Quick Reply
File: 1518989791203.png -(16921B / 16.52KB, 350x291) Thumbnail displayed, click image for full size. 16921
I'm helping a friend with her thesis and I can't decide what statistics test to use.

She has an experimental and control group, and she also data on the group members' gender. We've determined the emperimental group had higher test scores, which is a simple t-test.
If she wants to measure *if girls or boys in the control group had higher test scores*, what would be the test to run? Independent samples t-test can't be used because there's overlap in the groups.

Do we just look for correlation?
Thank you.
>>
Esther Manningwill - Sun, 18 Feb 2018 17:57:13 EST ID:sR7kJ2DP No.15611 Ignore Report Quick Reply
>>15609
I actually figured it out right after I posted it, but there's not a delete thread option anymore. Nobump!


Complex Analysis by Hamilton Dosslemene - Tue, 08 Aug 2017 21:15:47 EST ID:2Nfpe0g9 No.15547 Ignore Report Reply Quick Reply
File: 1502241347722.jpg -(39592B / 38.66KB, 331x499) Thumbnail displayed, click image for full size. 39592
Can somebody explain to me why I need to take a Complex Analysis class?

I'm doing a MS Mathematics and going on to a PhD in Statistics/Probability

I don't see any fucking point in studying Complex Anal.
>>
Ebenezer Demblekere - Thu, 10 Aug 2017 15:15:33 EST ID:gFrVWF8h No.15548 Ignore Report Quick Reply
>>15547

Are you sure you have to take that specific class? At my university there are distribution requirements, where you might have to take a year of some type of analysis class. Maybe you can change the MS program you are enrolled in to an applied math MS where the requirements are different. Even then, complex analysis is a branch of math that has a lot of real world uses, it's not like this is a class on Galois theory.

Here you are required to take 2 semesters of regular analysis, but not the complex.
>>
Walter Davinglock - Mon, 11 Sep 2017 09:56:07 EST ID:wdbZy6Bd No.15560 Ignore Report Quick Reply
>>15548
Yeah...actually I tried not taking it and my advisor said I have to.

Tbh now that I'm in the class it ain't bad. But I wanted to take a statistical theory course and own i cant.
>>
John Gemmertut - Sat, 23 Dec 2017 07:59:50 EST ID:18TzhZsM No.15597 Ignore Report Quick Reply
complex analysis is useful for a lot of things in math. Since your ms is in math and not statistics, complex analysis is considered an essential core course, like abstract algebra or real analysis. With your PhD studies in mind, complex analysis can be useful because it gives a way to evaluate a lot of different definite integrals over the entire real line. Even for real-valued functions, we can sometimes solve otherwise impossible integrals by passing to the complex plane, taking a clever contour, and then taking the limit as the contour expands. This comes up when you are trying to find the fourier transform of certain functions, for example, or when you want to integrate certain PDFs over the entire real line. It's a useful class anon. Even if it doesn't seem like it. Lots of great statisticians were at least proficient in complex analysis.
>>
William Dranderfotch - Tue, 13 Feb 2018 20:08:22 EST ID:Y3TAINA4 No.15607 Ignore Report Quick Reply
>>15547
Haha Then why are you studying math? You could say the same about most math subjects. I've had complex analysis twice already once for bachelors and once for masters. It is used throughout many other fields of math and used gratuitously by physicists.


Top 10 favourite Integers by Colonel Badtouch - Fri, 04 Nov 2016 15:38:05 EST ID:9bYxsT36 No.15261 Ignore Report Reply Quick Reply
File: 1478288285194.jpg -(104652B / 102.20KB, 640x427) Thumbnail displayed, click image for full size. 104652
Hey guys what are some of your favourite integers? Here's my top 10:
10. 34,236
9. 8
8. 457,893 ( I bet some of you thought this would be higher!)
7. 43.
6. 6 (Imagine that!)
5. 240
4. 9000
3. 7,777,777
2. 7, 777,771
  1. 108
12 posts and 5 images omitted. Click Reply to view.
>>
Nigel Cronningfudge - Mon, 01 May 2017 13:44:06 EST ID:QC/JAkzH No.15492 Ignore Report Quick Reply
I like 1, 3, 7 & 12. And 24. And 144,000
>>
Martha Deddlestat - Wed, 03 May 2017 12:52:44 EST ID:lYjTKStM No.15493 Ignore Report Quick Reply
The Fermat Primes https://oeis.org/A019434
3, 5, 17, 257, 65537

the form of 2^(2^m)+1 makes them just one too large to use 8 bit or 16 bit binary calculations (which might be alleviated and as such is part of the interest)
And they represent the number of sides of construable regular polygons which are as perfect as you can approximate a circle in their own right, in terms of relative the quality of approximation vs number of digits needed to do the calculation.
>>
Fanny Mippermid - Fri, 01 Dec 2017 14:38:59 EST ID:xLSFv1HV No.15590 Ignore Report Quick Reply
1512157139070.jpg -(16116B / 15.74KB, 225x225) Thumbnail displayed, click image for full size.
>>15261
  1. 420
2.69
3.666
4.80 (quatre-vingt means blaze it in french)
5.13
>>
Cedric Hogglechurk - Thu, 18 Jan 2018 17:20:11 EST ID:BLVxKgwM No.15600 Ignore Report Quick Reply
500, suckers. Fucking solid as hell.

147, what the fuck even is that?

33554432, just Fucking dancing on the edge of projected sanity and insanity
>>
Eugene Nuddledotch - Tue, 13 Feb 2018 08:32:55 EST ID:cHLNYuRD No.15606 Ignore Report Quick Reply
>>15261

8675309


Felps! by George Blackridge - Tue, 06 Jan 2015 10:34:20 EST ID:zBSUDYOt No.14551 Ignore Report Reply Quick Reply
File: 1420558460949.jpg -(7183B / 7.01KB, 206x245) Thumbnail displayed, click image for full size. 7183
Hey guys is there a free site to where you can choose which kind of math problems to take that isn't khan academy? I ask because either later this week or the week following I'll be taking a placement test to try and save money at college and to get back where I left off when I gave a shit about school. Thanks.
>>
George Blackridge - Tue, 06 Jan 2015 10:36:27 EST ID:zBSUDYOt No.14552 Ignore Report Quick Reply
>>14551
Kind of like a random question generator or something to that extent.
>>
Hedda Hommleforth - Tue, 06 Jan 2015 17:08:20 EST ID:HeP0kpt9 No.14553 Ignore Report Quick Reply
Just download textbooks or look up "high school algebra problem set" or "calculus problem set" or something.

Seriously, though, textbooks are where it's at.
>>
Molly Findleville - Sun, 11 Feb 2018 08:17:09 EST ID:P9TKAH4B No.15605 Ignore Report Quick Reply
I'm thinking about creating something of that sort. Like code wards but math wars. Although people are already using mathoverflow for that


Pickung up mathematics again by John Ceffingwick - Fri, 09 Feb 2018 13:05:24 EST ID:GjyUyNd4 No.15604 Ignore Report Reply Quick Reply
File: 1518199524302.jpg -(526599B / 514.26KB, 1200x1606) Thumbnail displayed, click image for full size. 526599
So i've got a question regarding university level math. I'd like to start studying Business Informatics. I'm currently working as a developer at a bank, so that's probably an advantage.
My problem is that I basically dropped learning mathematics when we started with functions like f(x)=12x²+4x³+23 and stuff like that. It's not that I'm not good, I had a few bad teachers and even more personal problems. Now i want to gitgud again.

So what resources should I consider? I'd like to get a some good recommendation regarding university-level mathematics that start small but go big.


Math help by Hugh Ponnerstork - Sun, 03 Dec 2017 12:53:39 EST ID:iVRKbSmx No.15591 Ignore Report Reply Quick Reply
File: 1512323619034.jpg -(707975B / 691.38KB, 1920x1080) Thumbnail displayed, click image for full size. 707975
Help me solve this equation for a,b,c, & d ...

3a - 4b + c - d = 0
>>
Emma Fiddlespear - Sun, 03 Dec 2017 15:14:24 EST ID:d8q0ZW2Y No.15592 Ignore Report Quick Reply
Insufficient data for meaningful response.
>>
Cyril Honeyshit - Mon, 18 Dec 2017 21:51:49 EST ID:9aoCBI3Y No.15595 Ignore Report Quick Reply
a= 0, b= 0, c= 0, d= 0 is a solution
>>
Lillian Pogglegold - Wed, 20 Dec 2017 17:33:18 EST ID:BDm+BNlx No.15596 Ignore Report Quick Reply
>>15591

There are infinitely many solutions
>>
Ian Chollystock - Thu, 28 Dec 2017 23:12:11 EST ID:QQuXTugO No.15598 Ignore Report Quick Reply
The fact that the equation is using the variables "a, b, c, and d" and it that they are equal to zero implies that this is a 3D plane equation. Like other people have pointed out, there are infinitely many points that would satisfy this equation in Euclidean space because geometrically speaking you can place an infinite number of points on any given plane.
>>
Emma Blullershit - Wed, 31 Jan 2018 09:04:20 EST ID:04lDhCQC No.15603 Ignore Report Quick Reply
>>15598
If it's over a finite ring there might only be finitely many points on the hyperplane.


Calc by Fry & Leela - Sun, 16 Jul 2017 12:43:38 EST ID:Rhgh4/nK No.15536 Ignore Report Reply Quick Reply
File: 1500223418101.jpg -(12838B / 12.54KB, 398x66) Thumbnail displayed, click image for full size. 12838
Can anyone tell me where to begin with this problem? I'm clueless. Our professor didn't cover it. I imagine start by taking d/dx and plugging the values in at some point?
Thanks
1 posts omitted. Click Reply to view.
>>
Fuck Murdridge - Tue, 18 Jul 2017 16:12:50 EST ID:XBxBdy5C No.15538 Ignore Report Quick Reply
>>15537

Pretty much this, but check the values at the endpoints of the interval too not just at local Mac/mins.
>>
Martha Hellyford - Wed, 19 Jul 2017 00:10:34 EST ID:cezjQDuj No.15540 Ignore Report Quick Reply
>>15537
>So that means that ANY time your d/dx crosses the y-axis, it creates a "local" maximum value
Oops, I meant
>creates a "local" max OR min value, i.e. just a peak/trough somewhere
It's only a max if the derivative's slope is negative around that zero
>>
Jack Bimmleshit - Sat, 11 Nov 2017 17:51:42 EST ID:y7H0hQp+ No.15583 Ignore Report Quick Reply
>>15540
or, an inflection point if f''(x) = 0
>>
Jack Ciblinghood - Sat, 18 Nov 2017 17:25:36 EST ID:BDm+BNlx No.15586 Ignore Report Quick Reply
>>15583

The concavity has to change for it to be an inflection point. If it's concave up, then a place where f''(x)=0, then goes back to being concave up, it's not an inflection point.
>>
Ian Chollystock - Thu, 28 Dec 2017 23:16:23 EST ID:QQuXTugO No.15599 Ignore Report Quick Reply
1514520983608.png -(15127B / 14.77KB, 615x345) Thumbnail displayed, click image for full size.
>>15536
What I would do first OP is I would graph the function and look at the range between 0 and 4 on the X axis and see if there's an obvious maximum. In this case, it looks like there is one.


What's the biggest number? by Nathaniel Sacklespear - Fri, 23 Sep 2016 09:54:08 EST ID:XssdERJk No.15209 Ignore Report Reply Quick Reply
File: 1474638848911.jpg -(72632B / 70.93KB, 720x960) Thumbnail displayed, click image for full size. 72632
Assume we had all the possible methods of information storage in the universe and all the resources of the universe at our whimsical disposal.

What's the largest number we could put down in some kind of recording before we ran out of universe?

So I guess the core question I'm asking is what's the most compact way to write large numbers? Is there anything that beats out scientific notation? And what's the greatest extreme to which we could conceivably take this?
30 posts and 3 images omitted. Click Reply to view.
>>
Eliza Blackworth - Tue, 29 Aug 2017 19:44:00 EST ID:z6ik/LbC No.15555 Ignore Report Quick Reply
>>15551
>It's incomprehensible.

For you maybe. Thousands of people have a solid understanding of infinity.
>>
Matilda Clipperhood - Sat, 09 Sep 2017 10:23:22 EST ID:vnPM6s0z No.15558 Ignore Report Quick Reply
>>15209
tree fiddy
>>
Priscilla Fidgehed - Thu, 30 Nov 2017 22:42:13 EST ID:fjf6McJz No.15589 Ignore Report Quick Reply
Man, back when I was a Jehovahs Witness a kind hearted but pretty stupid priest there once said "A Googolplex is the biggest number of all." And if you tried to explain to him that it isn't he'd get mad.
>>
Nell Bundleshaw - Wed, 06 Dec 2017 16:06:20 EST ID:F95jr/F4 No.15593 Ignore Report Quick Reply
>>15209
There's no real boundary between "notation" and "formula". Arabic numbers might be conceived as a sort of formula which takes a vector of integers to a finite power series (a1, a2, a3, a4, ...) -> (...((a1 * 10 + a2)*10 + a3)*10 + ...))...). Likewise you can have formulas like Conway's chained arrows which express huge numbers, for which the chained arrows effectively take the place of notation because writing 3->3->3->3 in Arabic numerals is already far beyond impossible.
>>
Cornelius Henningbanks - Tue, 12 Dec 2017 02:30:02 EST ID:BDm+BNlx No.15594 Ignore Report Quick Reply
>>15593

I would think of it as a function rather than a formula. Interpreting the conway notation as a function, its domain is sequences of natural numbers and the codomain is natural numbers. It just happens to be a function that takes larger values, and of course there is always going to be a function that provides numbers larger than the ones you would obtain with the conway notation.

In fact, natural numbers and all other mathematical objects are functions in some sense. You could think of the number 5 as being a class function from the set theoretical universe V into 2, that takes the value 1 on 0,1,2,3,4 and is 0 everywhere else. The empty set would be the function that takes the value 0 everywhere.

This doesn't work depending on what theory you are trying to formalize math in. For instance in ZFC you can't talk about a function f from V into 2, or V at all for that matter. So, everything is a function and whenever we write something it is a description of the desired function. Even the text itself could be considered a function.

We can reason about an arbitrarily large numbers using symbols. I could say that n is the smallest number that can't be written out in arabic numerals using all of the resources of the universe, and then talk about 2^n. I couldn't do this in the theory of arithmetic, because there is no way to formalize the idea of the amount of data stored in the universe within the theory. If you moved to a more powerful theory, then another problem occurs.

We don't really know what the universe is, how big it is, or other things that we would need to know to get a real answer. So to answer OPs questions:

We don't know what the largest number we could write down is because we don't know enough about the universe, and it depends on the type of notation we use to write down the number. There is no most compact way to write large numbers. There are many ways that you can beat scientific notation. You can take it as extreme as you want.

The largest numbers we have ever talked about come about from sentences like "The smallest number than can't be expressed in 100 characters or less by a formula of set theory". Y…
Comment too long. Click here to view the full text.


They don't wanna Talk about this very simple unsolved math: https://tinyurl.com/yd7okrue by Anonymous - Thu, 16 Nov 2017 11:42:57 EST ID:9RLAtG0r No.15585 Ignore Report Reply Quick Reply
File: 1510850577128.png -(478143B / 466.94KB, 1280x720) Thumbnail displayed, click image for full size. 478143
Here is the link to these secret problems: https://tinyurl.com/yd7okrue
>>
Rebecca Gendlelock - Wed, 22 Nov 2017 05:19:31 EST ID:m52FE4m4 No.15587 Ignore Report Quick Reply
I'm not clicking that link. What do you take me for, some sort of fool?
>>
Isabella Sugglenetch - Sun, 26 Nov 2017 07:31:40 EST ID:d8q0ZW2Y No.15588 Ignore Report Quick Reply
i bet your so-called link doesnt even relate to mathematics, you dirty bastard


Visually Understanding Math by Shit Blangertere - Tue, 17 Jun 2014 06:57:11 EST ID:RLkenDTl No.14091 Ignore Report Reply Quick Reply
File: 1403002631911.jpg -(499955B / 488.24KB, 1200x780) Thumbnail displayed, click image for full size. 499955
Hi guys,

Wondering if anyone could point me to an introductory level book on Math that teaches primarily by showing how to visualise the math so that I can understand HOW it works (as opposed to just memorising the equations/procedures and accepting that they work).

I'm thinking of going Feynman's Lectures atm, but am wondering if there's something better you guys might recommend.

Again, would like it to start at the very basics if possible.

Thanks and Jesus.
3 posts omitted. Click Reply to view.
>>
Sophie Blackhood - Tue, 29 Aug 2017 01:36:00 EST ID:m52FE4m4 No.15554 Ignore Report Quick Reply
>>14091
Source on the pic OP?
>>
Cyril Duvingbug - Thu, 07 Sep 2017 19:20:05 EST ID:m52FE4m4 No.15557 Ignore Report Quick Reply
>>14091
I need a source on this fucking picture.
>>
Polly Sungershit - Wed, 20 Sep 2017 18:08:15 EST ID:m52FE4m4 No.15564 Ignore Report Quick Reply
>>14091
SOURCE
>>
Lydia Wullyshaw - Mon, 02 Oct 2017 02:46:29 EST ID:Xel5TJuB No.15573 Ignore Report Quick Reply
The source is from Gizmodo's "sexy robot costume" contest 2010:
https://gizmodo.com/5664139/gizmodos-sexy-robot-costume-contest
>>
Priscilla Blucklewit - Fri, 10 Nov 2017 02:53:11 EST ID:m52FE4m4 No.15581 Ignore Report Quick Reply
>>15573
thanks bro


absolutely perfect resolution by discovery - Mon, 06 Nov 2017 21:35:10 EST ID:5rRuxZsJ No.15579 Ignore Report Reply Quick Reply
File: 1510022110016.png -(22781B / 22.25KB, 777x486) Thumbnail displayed, click image for full size. 22781
golden ratio
>>
Albert Brookwater - Tue, 07 Nov 2017 12:00:57 EST ID:BDm+BNlx No.15580 Ignore Report Quick Reply
>>15579

beautiful


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