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Archived threads in /sci/ - Science & Math - 131. page
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Hey /sci/, what are in your opinion the best books/publications for learning the basics of Topology?
16 replies and 3 images submitted. Click here to view.
>>
Adamson, I. A General Topology Workbook. Boston, MA: Birkhäuser, 1996.
Alexandrov, P. S. Elementary Concepts of Topology. New York: Dover, 1961.
Armstrong, M. A. Basic Topology, rev. ed. New York: Springer-Verlag, 1997.
Arnold, B. H. Intuitive Concepts in Elementary Topology. New York: Prentice-Hall, 1962.
Barr, S. Experiments in Topology. New York: Dover, 1964.
Berge, C. Topological Spaces Including a Treatment of Multi-Valued Functions, Vector Spaces and Convexity. New York: Dover, 1997.
Bishop, R. and Goldberg, S. Tensor Analysis on Manifolds. New York:...
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>>
>>8385763
Evans, J. W.; Harary, F.; and Lynn, M. S. "On the Computer Enumeration of Finite Topologies." Commun. ACM 10, 295-297 and 313, 1967.
Francis, G. K. A Topological Picturebook. New York: Springer-Verlag, 1987.
Gardner, M. Martin Gardner's Sixth Book of Mathematical Games from Scientific American. New York: Scribner's, 1971.
Gemignani, M. C. Elementary Topology. New York: Dover, 1990.
Gray, A. Modern Differential Geometry of Curves and Surfaces with Mathematica, 2nd ed. Boca Raton, FL:...
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>>8385766
Lietzmann, W. Visual Topology. London: Chatto and Windus, 1965.
Lipschutz, S. Theory and Problems of General Topology. New York: Schaum, 1965.
Mendelson, B. Introduction to Topology. New York: Dover, 1990.
Munkres, J. R. Elementary Differential Topology. Princeton, NJ: Princeton University Press, 1963.
Munkres, J. R. Topology: A First Course, 2nd ed. Upper Saddle River, NJ: Prentice-Hall, 2000.
Oliver, D. "GANG Library." http://www.gang.umass.edu/library/library_home.html.
Praslov, V. V....
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how do you take the limit of a radical function if x is under a radical on both the numerator and denominator? can i still use the conjugate rule?
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>>
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wrong one whoops
>>
What the x value you're asked to find the limit of?
>>
>>8385515
> take the limit

Are you asking how to take the derivative or just the limit, if the limit then what limit are you trying to evaluate?

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why aren't we going to jupiter
33 replies and 9 images submitted. Click here to view.
>>
>>8385446
because we're going to Europa:
http://www.thespacereview.com/article/3025/1

IT'S NOT JUST A GOOD IDEA, IT'S THE LAW.

It's also a law that NASA has to use the SLS to do it.
>>
>>8385446
Because we would get a trippy trip and return to be fetuses, apparently...
>>
>>8385446
Because that would make us stupider XDDDDDDDDD.

And NASA is too much of a pussy to wait that long for shit to go to jupiter.

There have been plans for deep entry atmo probes though

And they could get to like 200 bar XDDDDDDDD

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machine intelligence will outpace humans in 20 years or less
14 replies and 3 images submitted. Click here to view.
>>
this is why u learn CS dum fuck
math and physics are super automabable thanks to quantum computers
>>
>20 years
being a bit pessimistic arnt we?
I give it 5.
>>
>>8385380
this is the biggest meme I've seen today

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http://shameproject.com/profile/steven-d-levitt/
12 replies and 3 images submitted. Click here to view.
>>
>>8385327

Nah. Nate Silver actually make correct predictions.
>>
>>8385333
maybe in years before 2015.

Nate Silver makes a new prediction every week, which means at minimum he is wrong 51 weeks a year.
>>
thx, I was just thinking about buying the book

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Have you ever met an actual child prodigy? How good was he?
21 replies and 2 images submitted. Click here to view.
>>
*introduces myself*

ask me anything
>>
>>8385274
What are you good at?
>>
>>8385276
maths

I self taught programming at 12 and calculus 1&2 from 14-15

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OK guys you are the most intellectual people I know of, so answer this one question for me. Why does my poo poo sometimes green?
11 replies and 3 images submitted. Click here to view.
>>
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i ate playdoh when i was like 4 and my poo poo turned green

is that what happened t oyou?
>>
>>8385271
No my diet isn't playdoh anymore, mostly little caesers and papa John's, whenever I go to their restrooms for a checkup their poo poo always green. Why?
>>
It's one of the last great unanswered questions in medical science, actually. One that's appeared in the medical texts of every civilization in recorded history, and defied every attempt to explain it.

It's up there with aging and afterlife.

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Hi /sci/,
Ok I'm doing a degree in physics and I'm really not into pseudoscience bullshit but shit it is that I'm really small and it's starting to piss me off.
So I was wondering if some anons here knew any way for me to go over my genetical legacy with some magic chemicals to grow taller. Like three inches, maybe more. Seriously, you want to test your Marvel bullshit, call me please.
34 replies and 5 images submitted. Click here to view.
>>
>>8385198
Do this 5 times a day:

>sit cross legged on the floor
>reach up towards the ceiling
>whisper "grow, grow, grow"
>>
>>8385198
gotta stretch, I grew 9 inches by just stretching my back by the end you'll be able to suck your own dick when you're sitting down touching your feel with your hands (legs are straight) in fact that's how the grow taller community measures the part of the progress and a goal to have in mind cheers
>>
>>8385200
But what if I whisper "shrink" by accident?

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I recently graduated with a BA in math, and I fit some CS courses in there while also learning Russian. Now I'm looking for work; what can I realistically do now that will earn me loadsemoney? I don't care if it costs me my soul.
14 replies and 1 images submitted. Click here to view.
>>
Mathematician
>>
>>8385197
this

300k starting
>>
>>8385240
300k starting, what even is this meme

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Where did this meme start, and is it even accurate?
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>>
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>>8385111
Damn, that really made me increase my information

Also, checked
>>
Chekem
>>
>>8385111
it doesn't matter, please don't post threads like these

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Why is my calculator insisting the numerical approximation is three?
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>>
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why is my faggot OP insisting on posting disoriented photos?
>>
>>8385031
Srry boo idek how to fix it
>>
>>8385019
you seem to be a lazy fag not understanding anything.

A) first I don't see your dx in your integrals. this is wrong. fix that.

B) second you don't seem to understand that sqrt(1-cos(x)^2) = abs(sin(x)). Have you heard of the absolute value ? most stupid fags hear and then forget.

C) third you then have to separate the calculation of the function you're interested in between 0 and pi, and between pi and 3pi/2.

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So my quantum professor today said due to the uncertainty principle, it's possible for electrons to be moving faster than the speed of light (possibly infinitely fast), since they exist as a superposition of momentums, but only when we arent looking at them.

He says if you try to measure the electron's speed, its superposition will collapse into a wavefunction with a finite speed. Or he said something like even if you could measure the electron's speed without it knowing about it, it would still collapse once we processed that data, like quantum entanglement...
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17 replies and 2 images submitted. Click here to view.
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His point is about the entanglement of electrons, how they can be grenerated from the vacuum at large distances, seemingly ftl.
>>
>>8384837
>This is interesting but i dont see how it can be fair to say electrons move faster than light but only when we arent looking at them.
More than that, photons aren't actually going in straight lines. See https://www.youtube.com/watch?v=kMSgE62S6oo
>>
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>>8384837
Observations limit the potential of energy. By observing action with a limited awareness you are bringing the observed to the limits of your conscious state.

The frequency of our neural capacities cannot exceed the limit of our physical form, thus everything we observe must fit within those parameters.

We cannot even perceive the majority of our universe in our current physical form. Perhaps with innovations in technologies we can surpass these limits in the "near" future.

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How is this differential equation solved WITHOUT multiplying by the integration factor?
17 replies and 2 images submitted. Click here to view.
>>
General solution will be the solution to the homogeneous equation dy/dx+by=0 plus the non homogeneous equation dy/dx+by=a. Use method of undetermined parameters or variation of parameters to find solution of non homogeneous equation after finding solution to homogeneous equation and then add them together.
>>
>>8384785
Sorry I meant undetermined coefficients
>>
>>8384777
Use Laplace Transform.

can somebody tell me why the fuck this program won't fucking run
__________________________
#include <stdio.h>
#include <stdlib.h>

int main()
{
int number = 0;
printf("Chose your number faggot!\n");
scanf("%d ", &number);
if (number >=5) {

printf("OP is a nigga bish!\n");}
else {
printf("OP is still a faggot");
}

return 0;
}
___________________________

as soon as i enter a number and press "enter", this shit bar just goes...
Comment too long. Click here to view the full text.
16 replies and 2 images submitted. Click here to view.
>>
>>8384775
You have a space in your "%d".
>>
>>8384784
thank you thank you thank you

i owe you one anon and feel like a dumbass now thank you
>>
>>8384775
Why the fuck are you coding in C in 2016?

#include<iostream>
using namespace std;

int main(){
int number;
cout<<"Chose your number faggot!\n";
cin>>number;
if(number > 4)
cout<<"OP is a nigga bish!\n";
else
cout<<"OP is still a faggot";
return 0;
}

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What are some methods of memorizing the digits of pi?
31 replies and 8 images submitted. Click here to view.
>>
>>8384665

there's this thing called practice
>>
>>8384665
since there's only 10 possible values each digit can take you only really need to remember the order
>>
>>8384700
>decimal
we got a pleb in here

remember it in hexadecimal you peasants

Is it true that you can't be rational and emotional at the same time? Does emotion curb reason and vice versa?
14 replies and 2 images submitted. Click here to view.
>>
>>8384580
why not?
>>
>>8384580

I have a lot of very interesting opinions to offer on the matter but I'm afraid you'll have to post more cosplay Satsuki first
>>
>>8384596
Offer actual studies and I will.

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What are some studying tips for tips! Can you give me the high school science curriculum?! Thank You!!!
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>>
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>>8384479
Children don't belong on this website. Please refrain from browsing until you grow up.
>>
>>8384598
>posting a serious reply to a joke pic with a fedora wearing man and a gorillion world trade centers
>>
>>8384896
Alright ill leave... Oh and i posted that picture just get your attention. Thanks anyways!!!

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Why is sociology such a touchy-feely, wishy washy field fully of SJWs these days and not a true science?

Back in the day there were several attempts to develop a positivistic social science (Weber, Comte, Durkheim).

There's no a priori reason that a scientific approach to social questions should be ruled out.
30 replies and 3 images submitted. Click here to view.
>>
It is not the professors, it is the students. Put yourself in their flesh:
> Say something about criminal justice/race/sex
> Hordes of SJWs storm the President's office complaining
> Lose your job

Yep, it is much better to just surrender. However, if you have the support of the college administration you can still make it. Search about the University of Chicago, they have said no to safe spaces.
>>
I fucking hate all who study sociology. Always so strong opinioned and political and punchable.
>>
>>8384468
>There's no a priori reason that a scientific approach to social questions should be ruled out.
wew lad.

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If no energy or mass is created or destroyed, then how did the universe come to be?
17 replies and 4 images submitted. Click here to view.
>>
>>8384465
all the mass was in one point and then it spread like cancer dooming earth with life
>>
>>8384465
it didn't
back to >>>/x/
>>
>>8384475
also this

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when you discover new calculus

where is my PhD?
13 replies and 1 images submitted. Click here to view.
>>
>>8384438
(g o f)^(n) = sum Cn^k g^(k) f^(n-k)
>>
>>8384438
false for n=0
>>
>>8384438
>for $f(x) \neq 0$
for what values of $x$? or do you mean for $f \neq 0 \in C^n(\mathbb{R})$

>$\dfrac{d^n}{dx^n}\log[f(x)]$
>taking the derivative of a number instead of a function
daily reminder that leibniz notation is shit and 4chan is for 18+

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I excel at calculus but struggle with great difficulty in my programming and physics classes.

My programming professor said that people with good "intuition" is the key to their ease in these subjects. They just know what to do. They're really good at finding solutions without much practice or memorization.

How do I increase my intuition if I was born with the intuition of a mule?
22 replies and 1 images submitted. Click here to view.
>>
Learn the definition of intuition
>>
>t.brainlet
>>
Don't listen to these autists.

You gain intuition by

thinking about the topic in your head a lot. Once you have obsessed about it for a long amount of time then you just tend to have unconscious answers to questions that never became conscious, i.e intuition.

source;
I'm an expert on human intelligence.

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>Atmospheric CO2 level has reached the tipping point of 400 parts per million

Or more accurately, the annual low point of CO2 levels is now 400 ppm

Do we just have to move to Mars now? Is there a scenario where life as we know it on earth isn't doomed?
20 replies and 4 images submitted. Click here to view.
>>
>thread talking about the probably inevitable end of the world
>0 replies
>>
>>8384358
400ppm

Arbitrarily set by a bunch of socialist cucks who make billions of dollars a year.

400ppm means nothing. It's a literal drop in the bucket.
>>
thank the fucking lord were pumping more CO2, I wish we can emit more because its so cold lately ;_;

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I want to believe
24 replies and 1 images submitted. Click here to view.
>>
i am believe
>>
>>8384279
no?
but the corresponding octene is known
>>
>>8384279
saging for chemloli

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How cold would it have to be for your pee to freeze mid stream before it hit the ground?

I doubt it would be possible on earth without a manmade area, but who knows.
18 replies and 5 images submitted. Click here to view.
>>
>>8384203
cold enough for it to be immensely unhealthy, and likely frostbite inducing on your phallus upon contact with air temperature
>>
>>8384214
What if I designed some kind of insulated cock casing that only exposed the urethra and was able to reseal afterwards?
>>
>>8384222
but why

>undergraduates complaining that the course i'm TAing is hard.
30 replies and 7 images submitted. Click here to view.
>>
what are you TAing?
>>
>>8384164
>Calc 3
>>
>>8384168
>tfw Calc 2 was supposed to be the weed-out course
>tfw I'm in Calc 3 and somehow still surrounded by retards

Kill me.

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Antibiotic resistance can be transferred through horizontal transfer and plasmid conjugation, but can it also be transferred through viruses? I can't find any reliable free researches explaining this.
16 replies and 3 images submitted. Click here to view.
>>
>>8384039
It's definitely possible, the term you're looking for is "transduction".

https://en.wikipedia.org/wiki/Transduction_(genetics)

Look for "transduction of antibiotic resistance" or something similar. Afaik it happens, it's just that it's difficult to prove that conferred antibiotic resistance comes from bacteriophages. Transduction of antibiotic resistance is also assumed to be a small source of this acquired resistance compared to other sources, to the best of my...
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>>
>>8384060
>bacteria and viruses literally conspire against us
god damn it, nature
>>
of course. any means of genetic transfer can result in antibiotic resistance, provided the gene that is transfered codes for resistance to the certain antibiotic

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>the apple dropped on his head and he invented gravity
>invented

Stopped watching right there. Why are academic movies always so shit /sci/?
21 replies and 1 images submitted. Click here to view.
>>
>>8384005
He invented the specific concept of Newtonian gravity. Obviously gravity had already been "discovered" as people knew things fell down.
>>
>>8384017
Oh oh, here we fucking go again.

The abstraction of Newton's laws is still a discovery you filthy...non-Platonist.
>>
>>8384025
It's both and neither you autist. Therefore your shitty blog post is meaningless.

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This is the smartest person to ever have lived.

Prove me wrong.
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>>
>>8384000
I'm the smartest person to ever live, therefore your claim must be false.

Prove me wrong.
>>
>>8384022
One must provide proof to disprove another's claim, therefore your claim can be considered invalid.

Prove me wrong.
>>
>>8384000
>>8384022
>>8385735

You're all shifting the burden of proof - that's fallacious.

Prove me wrong.

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Because it does as much science as computers.
14 replies and 4 images submitted. Click here to view.
>>
/r computer "science" gif
>>
>>8384045
>>>/r.
>>
>>8383972
Probably the same reason it's called 1 kilobyte, when it's not even 1000 bytes.

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Would anyone be interested in me making short math 'lessons' on /sci/?

I remember OHP making a series of threads on categories and Brave New Algebra. (https://warosu.org/sci/thread/S8182284)
Unfortunately it stopped midway, but it inspired me to do something similar.
I would prefer focusing on elementary subjects, otherwise I'll have a lot of mistakes. Plus, I think covering the basics will be helpful to more people on the board.

I was thinking of either logic+set theory, introduction to number theory or some type of calculus/real analysis....
Comment too long. Click here to view the full text.
17 replies and 2 images submitted. Click here to view.
>>
sass, is that you?
>>
Go for it, OP. It'd be nice to see a decent thread on here that's actually about math/sci
>>
>>8383965
Number Theory doesn't really make sense to me, although I've been following this playlist by a HS teacher for now and it's okay-tier.

https://www.youtube.com/playlist?list=PLr3WmPgPWZfX1HUpeyKkP6ir2wOFhqXMO

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