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Archived threads in /sci/ - Science & Math - 307. page
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Hello /sci/.
There's a local math olympiad tomorrow which I'm taking, and I'm super nervous. Any advice?
>>
Stay hydrated and get a lot of sleep.
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>>8056983
>Be me back in highschool
>Did not give a shit about math
>Was having sex constantly
>Took the virginities of various girls way younger than me, like a 3 year difference
>Playing videogames up to 3 AM
>A lot of the times went to school without sleep and would sleep in class
>>
>>8057021
>best university for Maths
>mostly Cs
Roleplay elsewhere buddy

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What is asthma, and how do inhalers help?
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>>8056860
As someone who has asthma and have had it forever I can explain.

Whenever I consume something my body does not like then for some reason my breathing holes close from the inside and I start taking in only like 10% of the oxygen I would take originally, making me have to breath in really fast which then tires me out and shit.

Inhalers have a magic dust that make the holes open up again but also have the side effect of increasing blood pressure.
>>
>>8056864
i got asthma too, magic dust? really nigger?
>>
>>8056874
I don't know what it is man what do you want me to say? I study math, not chemistry.

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Are mathematicians all retarded, /sci/?
"In mathematics, the associative property ... Within an expression containing two or more occurrences in a row of the same associative operator, the order in which the operations are performed does not matter as long as the sequence of the operands is not changed."

>the order in which the operations are performed does not matter
>the order does not matter
>associative

How the fuck did they "associate", the...
>>
they could call the property hotdog for all i care
>>>/lit/
>>
Well its just means that (ab)c = a(bc)

As you can guess, it's quite nice property to have
>>
Consider addition. (A+B)+C=A+(B+C) is a statement of associativity. On the left hand side, A and B are associated with each other, where on the right, B and C are associated with each other. At least that has always been my interpretation.

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How do you deal with the inevitable heat death of the universe?

also welcome
>how do you deal with knowing that human civilization is a slave to it's biology and controlled by epigenetics, trapped in a spiral of rising and falling repeatedly for all time
>or with the fact that we've not had contact with any other intelligent life?
>or at least with the inevitable destruction of Earth and the solar system?
>>
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>>8056767

Fundamental particules are eternal.

Human brain is the most complexe object in all the universe.

The reality is always and inevitably more complex than we can imagine.
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>>8056767
I hope that by that time we'll all have transported our consciousnesses to another universes or some shiet like that.
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>>8056819

That's what happens when you die

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http://www.ibtimes.co.uk/sci-hub-offline-elsevier-gets-yet-another-pirate-bay-scientists-domain-name-shut-down-1558645

fuck elsevier
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>>8056597
>fuck elsevier

This really can't be said enough. Fuck elsevier.
>>
Independent people should just buy sci-hub related domain names and point it to their servers. That way it becomes practically impossible to block and shut down. You can make free dns-level subdomains here by the way: https://freedns.afraid.org
>>
>>8056597
What does Elsevier primarily publish?

I mostly read math and a very small amount of physics and I don't think I've ever even seen a book published by them.

Chasing down nerds on pirate bay is pretty sad practice for a textbook company though.

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Technology has not hit its peak, VR just in its infancy, ~20 years ago everything was fucking black and white, in the twilight zone of humanities fate of self destruction or infinite progression.

Just fuck my shit up. What are the FUCKING chances out of ALL the configurations that existed in the universe I had to be born in THIS present time

>Born too early to explore the universe, born too late to explore the world wasn't a meme but in fact real tea.
>>
>Born too early to explore the Earth
>Born too late to explore the galaxy
>Born just in time to buy psychedelics on the Internet
>>
>>8056529
You're not born in the worst time, though.

You're born in humanity's adolescence. The time is now to take your legacy to the stars. Information previously only acceptable to the sons of noblemen is now available with a simple search inquiry.

Now, anon, is the time the seeds empires spanning star systems are planted. Don't be sad that you aren't a denizen of the distant future. Be glad that you are a pioneer for it.
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>>8056537
I WANT TO KNOW WHAT HAPPENS IN THE END GOD DAMNIT!

I can barely sleep nowadays, theres so much suspense towards the human race, I want to know if we fuck ourselves up or not.

>Space
I doubt we'll be doing anything related to that in our lifetime, our energy efficiency is fucking terrible, just picture this - the fastest speeds we can reach is by dropping bombs and riding shockwaves.

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let's say I want to measure something inside a population

what is the number of people I need to survey ?
>>
bout tree fiddy
>>
30.
>>
All of them.

why can't we just scan each atom of the human body and log the scanned atoms as unique bit patterns and then send the bit patterns over the internet and then at the receiving end use the bit patterns to move matter in a way so that it corresponds to the original human body?
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Because you are stupid
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>>8056303
That's not teleportation, that's cloning. You would still die.
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>>8056303
>just scan
>to move matter
Those.

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What is the fastest way to calculate the harmonic sum of a number /sci/?

$\sum_{k=1}^{10000000000} (\frac{1}{k})$

in python or c++

WolframAlpha does it so fast yet my c++ program takes ages
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>>8056273
Hnnng
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>>8056273
This whole "lol I lift =P" meme needs to fucking die. Attractive bodies are literally all genetics. You either store muscle and fat in aesthetic places or don't and going to the gym is not going to change that. Go to any cbt on /fit/ and you will see dudes who have unattractive muscle insertions and lifting just made them look fucking stupid.

Take this very girl for example. Her ass and legs aren't shaped any better than average even though 99.9% of women her age cannot squat 135 lbs with...
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>>8056273
~9*ln(10) + gamma_euler = 21.3005

use Hn = ln(n) + gamma + sth negligible

Imagine Discovering That Your Teaching Assistant Really Is a Robot
http://www.wsj.com/articles/if-your-teacher-sounds-like-a-robot-you-might-be-on-to-something-1462546621

I've got bad news for you guys.
AI is NOT just going for the stupid jobs. It's heading straight for the PhD's jugular.

>Since January, “Jill,” as she was known to the artificial-intelligence class, had been helping graduate students design programs that allow computers to solve certain problems, like choosing...
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>>8056207
Why is this bad news? It's being trained to answer routine questions by looking at a dataset of questions that have been asked and answered correctly in the past. If anything this will help streamline education by removing all of that shitty redundancy bogging us down.

Also, lol at that retard who thinks we should have full disclosure about what you're talking to. Why does it fucking even matter. I think a good principle is:
>On the internet no one knows you're a dog.
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>>8056278
I think the main concern is that a lot of PhD students need this supplementary income to keep them going. If the typical TA team was 9 to start with it might now be accomplished by 3 who get the same pay as before leaving most PhD students with no fall back option.

>Also, lol at that retard who thinks we should have full disclosure about what you're talking to. Why does it fucking even matter. I think a good principle is:

He probably expects you and I to know each other's...
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>>8056318
>names
>nationality
>gender
>sex
>skin color
>ancestry
>...

Where does it stop?!

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http://www.nature.com/news/fat-lot-of-good-1.19845
>We have always been proud of our large brains. Indeed a century or so ago, men of science (and they usually were all men) would routinely measure human heads and weigh their brainy contents to prove our dominance over the beasts. (They did this as well as making false claims on the primacy of certain human groups over others.)

It's okay to compare humans to animals, but comparing humans to other humans is wrong? I don't get it. Please explain.
>>
Because it means you hate blacks
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http://www.sciencevsfeminism.com/the-myth-of-equality/sex-differences-general-intelligence/
>>
>>8056135
>It means I'm better than you.
>I could have lots of PhDs in any field I want.
>I just don't because I would rather spend my time telling people to look at the size of my head.
>That's how much better than you I am.
Top zoz

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You guys are way smarter than me at this.
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but it is science
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Fags who think they're cool just because they study "real" science. Science is science.
>>
chemistry and physics are the real sciences

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Can this reverse the effects of global warming?
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>>8055815
Paint all roads and roofs white. That will slow it down quite a bit.
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>>8055821
We'll need to set of mirrors on the oceans as well.
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>>8055815
People have thought of his. It really isn't that great of an idea. It's not fixing the main issue with global warming : greenhouse gases. Also if you take a fuck load of mirrors and throw them into space how the fuck will plants grow?

One of the best ways to combat climate change is to take excess CO2 and react it with basalt. The problem is that right now it's too expensive to do and no one really has a good idea of how to excessive atmospheric CO2 and pump it into the earth.

I'm...

NASA is building a fusion rocket, will get to Mars in 30 days launched atop SLS.

For patricians:
>https://www.nasa.gov/directorates/spacetech/niac/2012_phaseII_fellows_slough.html

For plebs:
>http://www.dailymail.co.uk/sciencetech/article-2612923/Could-travel-Mars-30-DAYS-Nasa-believes-nuclear-powered-rockets-make-trip-faster-cheaper.html

SpaceX BTFO
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>>8055610
2014?

>>
>>8055610
Fusion doesn't even work on earth.

These paper missions will be just that for the next 50 years, paper missions.
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>>8055652
What the fuck did you say about me, you little bitch? [...] You're fucking dead, kiddo.

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I have always been shitty at math, but have recently chosen to go into science. This requires mastery of calculus. I am currently in a geometry class that I will pass comfortably. My issue is that I want to take an Algebra 2 course, but I can't because I took the course in 2008. I forgot literally everything except how imaginary numbers work (don't ask why that stuck out). The college will not let me retake it even though I submitted a request citing my forgetting everything, claiming that I have "no legitimate reason." It will only allow me to take Trigonometry....
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>>8055556
underage bait
>>
>>8055564
I am in college. I just ignored math as a kid and I'm trying to correct that. Many adults cannot do any real math.
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>>8055556
>The college will not let me retake it even though I submitted a request citing my forgetting everything, claiming that I have "no legitimate reason."
What stops you from just showing up for the lectures, and to hell with anything exam-ish?

>Is it wise?
Not really. You can do a quick refresher course though.

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$\frac{\partial^2 f}{\partial x^2}=\frac{\partial^2 f}{\partial t^2} + (a+bt)f$

What is a non-trivial solution to this equation.
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>>8055423
>>
>>8055443
>>
>>8055423
fxx=ftt+(a+bt)f
Let f(x,t)=X(x)*T(t)
X''/X=T''/T+(a+bt)=constant

solve the ODEs

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How can science be objective if our reality is subjective?
>>
>>
>>8055400

Double dubs.

Reality is constructed in our brains. Science is essentially exploiting our senses which were strictly developed to help the propagation of information (DNA) through time.
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>>8055416
No, you have it completely backwards. Reality is objective. Our conceptions of it are, by definition, subjective. Science is the constant attempt to make our subjective conceptions of the reality more objective and accurate. There is only one reality and subjectivity is simply the necessary effect of being singular parts of that reality with specific vantage points.

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Starting with the release of Oliver Stone's Snowden, I think a significant amount of people will respond pretty terribly to the idea of being recorded constantly. It'll drive a lot of otherwise healthy people mentally unstable and reclusive, let alone anyone suffering from depression, anxiety, obsessions, compulsions etc etc

At some point no amount over government lies will hide the fact that everyone is being monitored by them and hackers. And the degree to which they will have access will only increase exponentially with technology.

I cannot imagine how much worse AI will make this.

Am I blowing things out of proportion? Am I totally off even?
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>>8055396
I felt this topic appropriate for the board given that a good discussion of it requires some understanding of mental health, surveillance technology, and maybe AI.
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>>8055401
Snowden was a terrorist, but so was Bush, so idk.
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>>8055396
>tfw the NSA pays someone to read our shitposts

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Which human language is best to learn for mathematics (after English ofc)?
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>>8055354
Chinese
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>>8055354
Why would you learn any language besides English if you want to do research mathematics? Everyone else around the globe learns English to communicate their mathematical ideas, not the other way around. See: Perelman, Mochizuki, and of course every other professional modern mathematician (I just noted those 2 because most people on /sci/ will recognize their names immediately).
>>
Why would you need to learn a language for mathematics?

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Sup /sci/, Math major (Applied Math/Statistics concentration) here.

Why is Pure Math so glorified here? It's honestly the least marketable thing you can do with mathematics amongst all the majors that require a decent amount of mathematics.

I get that it's interesting (I take interest in it as well). However, the only thing people do with it is teach retarded engineering majors at shitty universities how to take derivatives.

So why are you majoring in (pure) math, and what do you plan to do with it after you graduate?
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>>8055320
Isn't that an american only thing? My degree's title is only 'Mathematics'.

How can you even specialize in applied or pure in fucking undergrad?

I think it is a bit dumb.
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>>8055320
Because you should study what interests you, not just to get a job.
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>>8055320
>the only thing people do with it is teach dick sucking engineering majors how to take derivatives.
Is that an 'murican thing? Sure, most of those people in europoor teach aswell, but their main focus is on their own studies.

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What are the essential numerical methods?
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>>8055280
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>>8055280
For what? Integration? 1d or 2d? Matrix inversion? Stochastic diff eq?
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>>8055303
you forgot dividing

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Hey /sci/.

I'm trying to cultivate a fungus, but every time I start a crop another fungus always invades and kills my culture. Temperature and humidity control doesn't seem the problem - I've got a fairly rigorous setup that I check very frequently and sterilize thoroughly, so I'm thinking maybe the grain I'm using is contaminated? I kind of went the cheap route and used bird seed, so is there either a way to purify the bird seed before introducing the culture, or should I go with a different kind of grain? Recommendations?
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>>8055132
Boil it in a pressure cooker. Then inocculate it with your fungi. and keep in an environment without airflow that brings in environmental spores.

tl;dr google how to grow magic mushrooms properly, the guides are out there to avoid having your shrooms infected by the environment.
>>
make a home autoclave in a pressure cooker?

dry roast the bird seed?

buy lab grade food source for the fungi as bird seed is definitely super contaminated
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>>8055153
I'll admit, I can't actually find a lab grade supply of grain on any common online retailer. Is there a specific site for it?

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On average, I eat one apple an hour. If I wait 3 hours, what is the chance I have eaten 3 apples?
>>
None, because you were waiting and not eating apples.
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>>8054970
You understand what I meant, however.
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>>8054989
It was obvious af nigga

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Is there an approach to take to find the largest product that is possible to be made, by only multiplying one and only one number from each row and column?

Or even a brute force way I can use in Matlab.

Attached problem is easy example
>>
In this example i think (i may be wrong ) the answer would be (9*9*6*3)=1458

But is there a general method
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>>8054823

9*9*7*4 is the biggest product.

How big are the biggest grids you're working with? Because for an n*n grid, there are n! possible products. So you could brute force calculate them all and then choose the maximum, assuming n is small enough.
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>>8054823
9*9*7*4 is bigger

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solve this, genius
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1st
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>>8054788
Couldn't solve this one too.
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>>8054788
It's the last one

So many people here ask how to get better at math. Today I'll ask the opposite question.

How do I get worse at math? I hate to be that genius how always understands everything. I want to experience what it's like to struggle with math like an average brainlet.
>>
>>8054785
>I want to experience what it's like to struggle with math
Start studying Inter-Universal Teichmüller Theory.
>>
I used to be really smart until I abused drugs (namely amphetamines)

So try that
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>>8054807
No, life just requires more as you get older.
correlation doesn't equal causation.
confirmation bias to the max.
kill yourself.
-anon

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i dont get it. i can solve them with the elimination method fucking easily, but by substitution i get the wrong answer every fucking time. why?? why does my brain go vegetable when i do this??
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>>8054708
>>
it's because of your bad handwriting so you can't tell if line 2 starts with a one or a seven
>>
>>8054735
>>8054736
that's not my handwriting, i just pulled a pic off google images

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Anyone else just got abused by IB Physics exam?
>>
1) This is not related to science or math
2) underage
>>
>>8054775
1) It's a fucking PHYSICS exam... How autistic do you have to be to not understand the relationship between Science and Physics?
2) Basically everyone who writes IB Physics exam this year will be 18 and above, me included.
>>

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>I am become death, the destroyer of worlds.

what did he mean by this, /sci/?
>>
>>8054694
Worlds= the two arsecheeks orbiting your mums arsehole

destroyer of worlds = he destroyed your mums arse
>>
means he has shit grammar
>>
>>8054694
No idea why Oppenheimer's most famous quote is when he referenced the Bhagavad Gīta. Probably just trying to appeal to eccentric intellectuals which is why it has relevance in modern universities.

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Can we have a sci videogame develop thread?

simulations are welcome here too.
>>
>>8054671
>>
Play my game, /sci/.

https://scratch.mit.edu/projects/45937562/
>>
>>8054671
I think demoscene is more up /sci/ alley.
Search for Revision demoparty.
Throughout shader showdown competition last year (live coding event) few people made amazing stuff.
So if you are into math check that out.

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