[a / b / c / d / e / f / g / gif / h / hr / k / m / o / p / r / s / t / u / v / vg / vr / w / wg] [i / ic] [r9k / s4s / vip / qa] [cm / hm / lgbt / y] [3 / aco / adv / an / asp / bant / biz / cgl / ck / co / diy / fa / fit / gd / hc / his / int / jp / lit / mlp / mu / n / news / out / po / pol / qst / sci / soc / sp / tg / toy / trv / tv / vp / wsg / wsr / x] [Settings] [Search] [Home]
Settings Home
/sci/ - Science & Math

4chan Pass users can bypass this verification. [Learn More] [Login]
  • Please read the Rules and FAQ before posting.
  • Use with [math] tags for inline and [eqn] tags for block equations.
  • Right-click equations to view the source.

05/04/17New trial board added: /bant/ - International/Random
10/04/16New board for 4chan Pass users: /vip/ - Very Important Posts
06/20/16New 4chan Banner Contest with a chance to win a 4chan Pass! See the contest page for details.
[Hide] [Show All]

All work safe boards are now on the 4channel.org domain. Make sure to update your script blockers and whitelist the new domain.

There's now a setting option under Navigation to display the full list of boards on 4channel.org

The 4chan Vtuber Competition is over. Click here to see the winning entry!

[Catalog] [Archive]

File: sciguide.jpg (9 KB, 200x140)
9 KB
Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

If you want advice regarding college/university or your career path, go to /adv/ - Advice.

If you want help with your homework, go to /wsr/ - Worksafe Requests.

File: on19-Hyperloop.jpg (106 KB, 1200x674)
106 KB
106 KB JPG
Few years back people were calling this impossible and retarded.

Now we already have a bunch of companies working on them and may see the first operational one in 2-3 years.

Are they really going to be revolutionary?
126 replies and 6 images omitted. Click here to view.
Stop shilling yourself you fart huffing wanker
... and aerotrain was supposed to be a revolutionary technology that was going to replace railroads decades ago.
And that didn't require being vacuum tubes hundreds of kilometers long
File: 1547757845356.png (243 KB, 998x1140)
243 KB
243 KB PNG

Still doesn't mean it's retarded. And it's not revolutionary. People thought of this waaaaay elon meme musk.
how is this any different to the london underground? you're just adding more complexity
File: gotta go fast.jpg (39 KB, 675x900)
39 KB
>how is this any different to the london underground?
Sanic Speed.
Where something like that would shine would be in like cross country trips.

Why is hacking easier than it seems?
4 replies omitted. Click here to view.
Hacking into what? Your neighbor's wifi router that hasn't had its firmware updated in 5 years?
Why is seemed hacker easy
Not science or math
Because you have pre-built tools for nearly any purpose.
The only that requires skill, is getting around stuff like the persistent threat AI security systems of bigger businesses.
Or breaching so-called unhackable mainframes.
>The only that requires skill, is getting around stuff like the persistent threat AI security systems of bigger businesses.
This really sticks me with a "only worry about things we can measure" feeling. Ideally, the AI security would be able to detect anomalies like powershell being opened by someone in HR or similar, but there's just too many ways to go about entering and there's no way a system can constantly be trained on all behaviors or be testing all behaviors in anywhere close to real time. You have to reduce the amount of things you look for, but if you've narrowed down what to look for, wouldn't it just be easier to just fix those problems directly instead of using AI? Amazon already has accounts auto-locked if they try to mine a ton of bitcoins out of the blue. Any decent security team will notice if a huge amount of data starts being uploaded. What is really gained from the AI approach?

File: latest[1].png (247 KB, 1200x1042)
247 KB
247 KB PNG
This is what /sci/ actually believes
229 replies and 42 images omitted. Click here to view.
Ashkenazi had very low IQs in the 1800s and early 1900’s but their IQs had grown to above average by WW2. Almost like IQ is mostly nurture.
>Almost like IQ is mostly nurture.

They've been goyed
>coping this hard
flynn effect. everyone's iq was significantly lower centuries ago

jews are the superior race, just accept it. fuck a jewish woman at the first opportunity otherwise you are a useless human being and should an hero
Wrong. The average IQ is 100 and always will be because of the way IQ is calculated. Ashkenazi Jews had an average IQ below 100 in the 1800’s and very early 1900’s, meaning below the average of the collective at the time, and their IQ was above 100 by the 1940’s, meaning their IQs were above average of the collective at the time.

Goddamn you don’t know shit about how IQ is calculated.
>Create IQ test from Western ideals of intelligence.
>Apply them to non-Western population, get lower scores.
>Estimate hereditary component within-group.
>Racists then try and use this culturally bias test and estimates from within-group variance as "proof" for between-group variance.
>Then claim tenuous unscientific "superiority" as somehow "forbidden scientific truth".
The only truth here is that you're all racists.

File: d58d8.jpg (55 KB, 500x473)
55 KB
What happens if a surgeon suddenly sneezes during operation?
2 replies omitted. Click here to view.
>The mask won't be able to completely contain a powerful sneeze.
They're specifically designed to do that.
it would be extremely painful
you're a big guy
If the mask is taken off and they sneeze, would you die?
for (You)
Block your nose and the urge to sneeze goes away. Next question

File: Poppie.jpg (32 KB, 278x381)
32 KB
Why do so many in the scientific community think space travel is more important than curing cancer?
4 replies and 1 image omitted. Click here to view.
File: chevrolet-citation-3.jpg (26 KB, 400x220)
26 KB
Stating facts not in evidence.
We cant let the dumb mediots get ahead.
Ignoring the real issue: Where are the genetically engineered catgirls?
Because it's harder to kill each other from farther distances.
>Implying we can’t do both

File: Unknown-1.png (7 KB, 403x125)
7 KB
2 replies omitted. Click here to view.
Very small school, one of the best engineering in the country. Cheap, Socorro sucks balls. I went there.
What are your stats?
>one of the best engineering in the country
I'v never heard about it. What makes it good?
How well do they place students?
I don't know much about it but I also hear Soccoro sucks balls and there are no girls. I live in ABQ and work as a government researcher if you wanna ask me about that. Fuck dude if you're planning on staying in NM maybe just go to UNM. I don't know how they compare to NM Tech but even if NM Tech is better fuck living in Socorro. Pretty cool how much awesome STEM shit goes on in this state, I'm kinda jelly of people from here since I had to move away from my family for this type of career

i'm still pretty skeptical.
114 replies and 16 images omitted. Click here to view.
Not quite sure what you're referring to.
X-wings have pylons for converging cannons, though you could argue that having them strapped to the hull would have accomplished the same.
You could argue the name, but Y-wings and A-wings don't have wings.
I’m sure musk eventually got fed up with how much of a of shitshow the carbon composite was turning out to be
kill yourself dumb nigger
Wait this is an actual thing I thought it was just another musk meme
It's just a test hopper with a fancy shell on it.

File: pinky down.jpg (79 KB, 1300x1300)
79 KB
Can you guys fold your pinky finger down without your ring finger moving? I can do it on my left hand but it is impossible on my right (ring finger follows pinky). What is going on here?
7 replies omitted. Click here to view.
same here
The flexor tendons that move our fingers are connected to each other, so moving one finger moves the adjacent ones. Practicing your motor skills reduces that.
Do you think my motor skills are better in my left hand than right?
That's nothing, here's a real challenge. Try to close one eye without closing the other.
I've got this weird trick I can do with my pinky toe where it looks and moves perfectly normal, but I can also like cross it against the base of the next toe. It's weird and it's something I've grossed people out with for years. I've been able to do it since I was a kid, perfectly naturally, but only on one foot.
So what the fuck causes that?

Is this mental disorder common in academia?
lol, did you try to show everyone you were smarter than your prof to only get shut down?
I've met a few people like that. Life has a way of bringing everyone back down to Earth, one way or another. It's just a matter of time. I wouldn't worry too much about such people. But if you're forced to interact with them, try to minimize these interactions as much as you can and do your own thing.
Everything in that pic can be related to some insecurities, how "bad" must it be ti be a full disorder?

File: global-warming.jpg (271 KB, 1126x803)
271 KB
271 KB JPG
I am sure /sci/ got some brilliant ideas.
51 replies and 11 images omitted. Click here to view.
File: professor_cat.png (277 KB, 479x298)
277 KB
277 KB PNG
Yes, I had realized this. I also realized that I must look very dumb to someone who obviously hasn't even read the thread before replying, neglecting to refute any counterpoints that CO2's magical property of a 'greenhouse gas' has never and will never be experimentally proven, as all 3rd party data has confirmed that CO2 always has a net 'CO'OLING effect, it's even hinted by the two letters of the molecule. Time to get a real job, globo-warming shills.
Get rid of 95% of human population. Offer gibs to poor in exchange for sterilization and pour chemicals into water to turn the frogs gay
>That's because they want to turn the first world into third world to solve the problem
I guess that WOULD solve the problem. I sincerely doubt "sustainability" is possible, or at least that we can control ourselves enough to have a sustainable economy. Everyone might have good intentions, but not enough people are following through, or ever will.
It's proven right here >>10317733. By your own argument in OP the effect exists since CO2 does not block the same amount of incoming energy as it does outgoing energy. Why make the argument that it blocks both if the opposite is irrelevant?
It would, but who wants to live in a world where everyone is poor and miserable? Might as well not stop climate change to begin with if the outcome is the same

File: IMG_20190118_092644.jpg (2.7 MB, 3456x3456)
2.7 MB
2.7 MB JPG
I always liked bookedshelf threads, whatever happend to them?

These are maily books i had ti buybfor my undergrad, nothing fancy but i like most of them.
73 replies and 16 images omitted. Click here to view.
>I'm just an undergrad
>Serre's books
they look brand new
File: gsm-114-1.png (70 KB, 1211x1730)
70 KB
How's pic related for self-studying Abstract Algebra?
File: sssssssssss.jpg (821 KB, 4897x3265)
821 KB
821 KB JPG
The three at the end are library books. My favorites are Weinberg's qm and qft books, Zee's qft, Artin's algebra, Milnor's differential topology, Geroch's mathematical physics, Atiyah and Macdonald's commutative algebra, Hermann's lie groups. Left out of the photo are some linear algebra books, Nering, Friedberg et al, Lang, and Griffiths' electrodynamics. Also Garrity's electricity and magnetism for mathematicians. Soon to arrive are Rotman's advanced modern algebra, Guillemin and Pollack's differential topology, and Lieb and Loss's analysis.

I'm not deep in algebraic geometry yet, just a basic course on classical varieties. I'll probably look at Qing Liu and Hartshorne's books eventually. The books I have seem alright right now, An Invitation to algebraic geometry and Lectures on Curves... are especially friendly. Sagan's book on the symmetric group is very interesting, it'll be good to get some exposure to combinatorics. Maybe eventually I'll study the more theoretical physics books at the top right. I'm not really sure where to go in that though, it's pretty confusing.

It's good. Artin is worth a look at all. Not a big fan of the other standards like Herstein, Dummit and Foote, Lang, Hungerford. There are some easier books like Fraleigh but I don't have any experience with those, I studied algebra later on.

People rarely read everything within these books. Also references are important, you will forget things eventually.

I bought the majority of books in this picture for under $20 used. A few at $30. None above.

Lahiri and Pal is a friendly qft book to start. Shankar's qm is sufficient.

Weinberg is the only book that's actually thorough in building qft. And it's hard to find better books for the later volumes. It does take a while to read though. I don't agree that Srednicki is better than Peskin, they're about equal, good at different things.

Comment too long. Click here to view the full text.
They tie into undergrad research I'm doing

File: 1432724756686s.jpg (7 KB, 250x241)
7 KB
what's the point of limits, why do you need to find the value as it "approaches" a number rather than just using that number
4 replies omitted. Click here to view.
lol stick to engineering
to break them
What's (x^2 - 2x - 8)/(x - 4) like when x is close to 4?
At 4 it's undefined, but it's certainly close to 6 whenever x is near 4, isn't it?
When x is 4.01, it's (16.0801 - 8.02 - 8)/0.01 = 6.01. Similarly if you take x = 3.99, you get 5.99.
Limits are how we're able to understand this properly.
brainlet high school student detected

File: 1542005232514.jpg (101 KB, 683x850)
101 KB
101 KB JPG
>Consciousness is a quantum phenomenon
If you don't agree, then you probably believe in some kind of magic.
30 replies and 4 images omitted. Click here to view.
My theory is that consciousness is a wave of energy that your brain receives. Meaning consciousness is one, but we experience it differently because this wave of energy can travel while having multiple wavelengths at once and each conscious being has a unique wavelength to tune into, causing the brain to block out other conscious beings' thoughts.
>My theory is that consciousness is a wave of energy that your brain receives. Meaning consciousness is one, but we experience it differently because this wave of energy can travel while having multiple wavelengths at once and each conscious being has a unique wavelength to tune into, causing the brain to block out other conscious beings' thoughts.
>because this wave of energy can travel while having multiple wavelengths at once and each conscious being has a unique wavelength to tune into
gotta quit the weed dude
>gotta quit the weed dude
What's wrong with my statement? The electromagnetic spectrum represents the a continuous stream of photons that has a shape that consists of multiple wavelengths. Think about how visible light works. When you blend blue and red together you get purple. Purple has properties of blue and red, mean it is a mix of those wavelengths in a single wave. Don't tell me that this couldn't be the case with a wave of consciousness.
>a continuous stream of photons
there is no such thing as a continuum in QFT

File: image1.jpg (6 KB, 192x192)
6 KB
I think it is unlikely that one mathematicians has an in-depth understanding of many fields. It is more likely that he is made up or a conflation of different people, like Homer, Euclid, or Nicholas Bourbaki. He could also be a hoax by the Chinese government or UCLA in order to increase their prestige.
2 replies omitted. Click here to view.
When in doubt, inspect the brain case. Terry Tao is borderline microcephalic when compared side by side with Ed "THE PHENOTYPE ASHKENAZI WOMEN CRAVE" Witten.
Sometimes I also wonder if Bourgain is an alien and Gauss the son of God. Tao, like his OG mentor Erdos, is very good at leveraging his massive problem solving experience, and it actually gets easier with time to smell answers miles of paper & ink away. Feynman is another example, no conspiracy here.
ITT ebin shitposters

terry is clearly a gifted mathematician; watch any of his lectures (unless you're a brainlet, in that case just trust me)
I mean I've met him and he was basically impossible to talk to but his lecture was wonderful. Almost definitely not a hoax.
reminder that tao got a bronze medal at the athe IMO at the age of 10.
pretty sure it's ironic
tell us the story

Delete Post: [File Only] Style:
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
[Disable Mobile View / Use Desktop Site]

[Enable Mobile View / Use Mobile Site]

All trademarks and copyrights on this page are owned by their respective parties. Images uploaded are the responsibility of the Poster. Comments are owned by the Poster.