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

Name
Options
Subject
Comment
Verification
4chan Pass users can bypass this verification. [Learn More] [Login]
File
  • Please read the Rules and FAQ before posting.
  • Additional supported file types are: PDF
  • Use with [math] tags for inline and [eqn] tags for block equations.
  • Right-click equations to view the source.

08/21/20New boards added: /vrpg/, /vmg/, /vst/ and /vm/
05/04/17New trial board added: /bant/ - International/Random
10/04/16New board for 4chan Pass users: /vip/ - Very Important Posts
[Hide] [Show All]


[Advertise on 4chan]

[Catalog] [Archive]

File: IMG_4061.png (160 KB, 1000x1000)
160 KB
160 KB PNG
>elon musk makes a post on xitter shittalking nuclear fusion research and calling it a waste of resources
>a day later the top fusion scientist in the country is murdered
were just gonna pretend like these things arent related?
7 replies and 2 images omitted. Click here to view.
>>
>>16873125
Sex with XJ9
>>
>>16873129
Apartheid falling
>>
>>16873131
The sun can't always be there when you need it.
>>
>>16873131
he's dumber than a 5th grader
>>
>>16873307
Trunp will grant 25bil on reasearch to his own fusion company. Elon is angry that it wasn't him who got the grant.

File: 1766093496858780.png (30 KB, 585x400)
30 KB
30 KB PNG
Hello /sci/ is fusion real? Saw this on /pol/ and I always thought that it was fake, but I am not the brightest bulb on the tree.
https://sys.4chan.org/derefer?url=https%3A%2F%2Fwww.wsj.com%2Fbusiness%2Fdeals%2Ftrump-media-tae-technologies-merger-ai-fusion-power-b9ac22a5
1 reply omitted. Click here to view.
>>
File: hq720.jpg (69 KB, 686x386)
69 KB
69 KB JPG
Its not real as long as people in economic positions say it's not real.
>>
>>16873680
Lol.
>>
>>16873686
spbp
>>16873680
fuck you glow nigger
>>
>>16873678
if you're dumb, do yourself a favor and stay off brainrot like /pol/
and pro tip: /sci/ is one of the dumbest places on the entire internet
>>
It's real. But it's just a scam. He merges with them and the government will give them 25bil to develope that nuclear fusion. Most of the money will be stolen.

Life is short and you only get one chance to see the end of the world.
>>
I unironically believe in reincarnation.
>>
>>16873778
I unironically believe in ExoIncarnation
>>
>>16873768
How many black cocks do you think have blasted cum into his tight jewish asshole?
>>16873778
Me too. I kinda wish I didn't...
>>
>>16873778
Unironically isn't a word.

Why the scientific consensus says that women and men have the same iq if imperial data contradicts this statement?
129 replies and 6 images omitted. Click here to view.
>>
>>16870960
What pseudoscience?
>>
>>16871495
That's some glorious cope.
>>
>>16867753
>>16868187
My working memory and processing speed are shit (especially processing speed, in college I did a battery of cognitive testing and my processing speed was in the 4th percentile) but for some reason I always did very well on timed exams and tests in school. I'm not particularly intelligent or studious either. I guess other aspects of my cognition pick up the slack for me slow reaction time and mid working memory.
>>
>>16845334
The official scientific perspective is that men and women have separate but equal brains :-)
>>
>>16873920
You are so stupid

I don't understand why the author states that we can divide the elements of M into 8 classes, what stops us from dividing them into 9 classes instead. There are no restrictions on how many times we multiply the same prime right?
The book is "A Walk Through combinatorics" by Miklos Bona.
(I will post the solution given by the book below)
1 reply and 1 image omitted. Click here to view.
>>
>>16873965
Write out the prime factorization of an element of M, and consider the parity of each exponent. For each of these exponents, there are two options - odd or even - and since there are only three primes less than 6, this gives 2^3=8 possible exponent parity combinations. Then by the pigeonhole principle, since M has 9 elements, at least two of them must have the same exponent parity combination. The product of two such elements is then a perfect square.
>>
File: 1757332883771621.png (362 KB, 657x797)
362 KB
362 KB PNG
>>16873971
Thanks a lot, I understand the solution now.
>>
>>16873986
I didn’t even understand the question.
>>
>>16873965
2, 2, 2, 2, 2, 2, 2, 2, 2
>>
[math]\[
\text{Since no element of } M \text{ has a prime divisor } >6,\ \text{every } m\in M \text{ has prime factors only in } \{2,3,5\}.
\]
Hence we can write uniquely
\[
m = 2^{a}3^{b}5^{c}\qquad (a,b,c\in \mathbb{Z}_{\ge 0}).
\]

Define the parity vector
\[
\pi(m) := (a\bmod 2,\; b\bmod 2,\; c\bmod 2)\in \{0,1\}^3.
\]
There are only \(2^3=8\) possible values of \(\pi(m)\), but \(M\) contains \(9\) integers.
By the pigeonhole principle, there exist distinct \(x,y\in M\) such that
\[
\pi(x)=\pi(y).
\]

Write \(x=2^{a}3^{b}5^{c}\) and \(y=2^{a'}3^{b'}5^{c'}\).
Then

Comment too long. Click here to view the full text.

File: drlexus.png (272 KB, 538x333)
272 KB
272 KB PNG
Don't give out advice, don't reply to the schizofag... unless you're bored.
306 replies and 48 images omitted. Click here to view.
>>
i wish i wasn’t the class sperg and that i could do-over these years
>>
File: cata.jpg (20 KB, 540x540)
20 KB
20 KB JPG
my left ear has been ringing for 6 hours now, tinnitus shit
thought it would pass at first but it just keeps going
should i just sleep on it or try something?
>>
>>16874027
probably infected
>>
>>16874027
HIV, it's inoperable
>>
>>16874033
>>16874041
i can't die now, i have shit to do next week

File: James-Watson.png (377 KB, 548x784)
377 KB
377 KB PNG
This giant of biology has recently passed at the age of 97. What's the verdict? Gifted pioneer of scientific inquiry or scheming, bigoted plagiarist? There is no middle ground.
51 replies and 2 images omitted. Click here to view.
>>
File: IMG_8770.jpg (574 KB, 1488x843)
574 KB
574 KB JPG
>>16860630
The fertility rate across the world is declining. India's fertility rate has already dropped below replacement level.
>>
>>16870849
What is "In the Pipeline" exactly? Are those suicides linked to Summers specifically?
>>
Previous thread

>>16839821
>>
>>16872057
Nooo I should have bumped
>>
Reee

File: 0_WkQ93B495gbzBN5O.png (409 KB, 1200x846)
409 KB
409 KB PNG
>entropy always increases!
Uhh, so scary, such an unavoidable physical limitation.
What about the second derivative though?
>actually, they're no physical law telling you that it can't be slowed down, sped up - you're completely free to set the rate at which it increases.
So, basically it's not a big deal.
Always increasing variables are not so special either - for example time is like that as well and no one is making a big deal of that.
5 replies omitted. Click here to view.
>>
>>16873929
Energy levels of whatever system you’re considering.
>b-b-but what’s energy
learn differential geometry and how the energy functional relates to trajectories
>>
>>16873995
tell me the energy levels of an electron in a hydrogen atom using that faggy equation
>>
>>16874008
You seem familiar with it, so why should I? It’s a basic PDE.
>>
>>16873995
>learn differential geometry and how the energy functional relates to trajectories

Lagrangian application should be left to people calculating proper distance of backetball thrown by a trained nigger. Almost number one fallacy of the previous history of physics is to widely apply somewhat intuitive method of this kind to places where it could be applicable and places where it could be attached not.

inb4 same people are trying to convince the rest with crap formulations like mentioned Shannon measure or Landauer principle, which are both bastard byproducts of human thought.
>>
>>16874010
i am familiar with it, and have never seen it derived with the shannon entropy. go ahead, show me

File: H-CB GW.png (650 KB, 1280x720)
650 KB
650 KB PNG
This is the Hercules-Corona Borealis Great Wall, the largest known structure in the universe, a massive galaxy filament stretching about 10 billion light-years across. This breaks the laws of physics as we know it. The Cosmological Principle says no matter where you are in the universe if you look in any direction you should see an even distribution of matter this in turn creates a limit for the sizes of objects. It's about 1.2 billion light years
meaning that this structure is 8 times the supposedly limit of the largest
object possible.
2 replies omitted. Click here to view.
>>
>>16869804
I think the easiest answer to a lot of cosmological discrepancies is that the Big Bang was not constant. Starting the universe might of been more like starting the engine of an old car, it took a couple of tries and the oscillations from the last few attempts are still around.

The one that does actually bug me is the Hubble Tension, that aspect of the universe should have already sorted itself out by now even if the Big Bang was messy.
>>
>draws conclusions on visable mass
>85% of reality is unvisable mass
>>
>>16869804
And it’s in Hebrew letters
>>
>>16869826
>and call that a strucutre. Or you could just join up multiple filamnets and call it one big structure.
Filaments are the same structure as open-cell foam. The void "expands" and the mass in the filament collapses gravitationally.
>>
>>16871084
it is ad-visable to spell 'visible' correctly, though.

It's impossible for aging to be cured in the next 500 years, if it were even theoretically possible.
19 replies and 3 images omitted. Click here to view.
>>
>>16868051
>It's impossible for aging to be cured in the next 500 years, if it were even theoretically possible.
It's probably going to happen within the next 100 years or so. It's a very complex problem, but it's fairly well identified by now. It'll NEVER be a single therapy; you're looking at around 500+ targeted interventions to ack-shilly get to negligible senescence, but Bryan Johnson is vaguely credibly half way there.

>>16868209
>blah blah Marxist propaganda
I'm already approaching six figures on supplement spending, and clankers are saying I look 12-13 years too young. I'm on more supplements than Bryan Johnson, and you're just coming off prole-coded, kek.

>>16868347
>>16868502
The adrenochrome thing is a hoax. Fear and Loathing in Las Vegas got Adrenochrome right except that it's easy to make from an Epi-Pen plus air.

>>16869741
Largely CIRBP for bowhead whales, would not surprise me if the Greenland sharks have a lot too.

>>16869798
Not exactly a hoax, but the Schizo Yarmulke factor experiments are only doubling the lifespans of mice so far, not any closer to a "cure" for aging than Bad Luck Bryan's stack. There are interventions like Helichrysum italicum Hydrolate functioning as broader-spectrum Yamanaka inducers than DWS's stack, and it's smarter to just skip all that and induce GSTA4 downstream, kek.
>t. read Sinclair's Schizo Yarmulke factor paper on eye regeneration
>>
>>16868051
You only need to stop the aging for the brain if you are ok with being a cyborg
>>
>>16868051
What if it was, just hypothetically, already cured?
But not in us, in 8000 year old mummies.
And what if, just hypothetically, those mummies genetic code was sequenced 30 years ago?
And what if, just hypothetically, various people are already being treated with genetic therapies based on these ancient gene sequences?
>>
>>16872585
PS: Look for drastic hair and eye color lightening in wealthy individuals.
>>
>>16870060
You can’t buy capsules of Helichrysum italicum on Amazon.

>MIT physics and nuclear-science professor and director of MIT's Plasma Science and Fusion Center shot to death at his Brookline condo
Who else is next?
30 replies and 3 images omitted. Click here to view.
>>
>>16873801
Why are the Portuguese so violent? We should never have imported them to America
>>
>>16873539
>>16873801
>Jealous of your peer from uni
>Dropped out of Brown's physics program
>Shoot up a bunch of random students at brown
>Go to MIT and gun down your peer
>Commit sudoku
I can understand jealousy. But why kill random students at brown? What did they do to him
>>
>>16872412
>If let's say he was leaking info to China, then he would either forced to leak fake info or prosecuted by trial
All of that takes time and effort. Sometimes the best way to deal with (percieved) spies/traitors is to just shoot them. Just pop a cap in that nigga's ass. Capeesh?
>>
>>16873918
General rage that wasn't satisfied by the first shooting so it became focused rage. When that didn't sooth his soul, he self deleted, ending the rage.
>>
>>16873918
Maybe he went full schizo and believed that he needed to carry out certain missions. We make fun of the internet schizos who post their delusions for months or years on end but the real world manifestations can be pretty scary.

File: sqt-ac.jpg (863 KB, 1000x667)
863 KB
863 KB JPG
/sqt/ - simple questions thread (aka /qtddtot/)

Previous thread: >>16759536

>what is /sqt/ for?
Basic questions regarding maths and science. Also homework.
>where do I go for advice?
>>>/sci/scg or >>>/adv/
>where do I go for other questions and requests?
>>>/wsr/ >>>/g/sqt >>>/diy/sqt etc.
>how do I post math symbols (Latex)?
rentry.org/sci-latex-v1
>a plain google search didn't return anything, is there anything else I should try before asking the question here?
scholar.google.com
>where can I search for proofs?
proofwiki.org
>where can I look up if the question has already been asked here?
warosu.org/sci
eientei.xyz/sci
>how do I optimize an image losslessly?

Comment too long. Click here to view the full text.
141 replies and 21 images omitted. Click here to view.
>>
>>16873650
>What does f = ma actually mean?
https://physicstoday.aip.org/opinion/whence-the-force-of-f-ma-i-culture-shock
https://physicstoday.aip.org/opinion/whence-the-force-of-f-ma-ii-rationalizations
https://physicstoday.aip.org/opinion/whence-the-force-of-f-ma-iii-cultural-diversity
>>
>>16872241
It's obviously two circles overlapping in some way. The extent of the overlap is a simple calculus problem you can do.
>>
>>16873650
p := mv
f := dp/dt
Assuming a := dm/dt = 0, them f = ma. If not, then f = ma + v*dm/dt (think rockets ejecting burnt fuel behind them as they fly)

Newton definition+assumption 1: p := mv remains constant if the object never interacts with anything else
Newton definition 2: f := dp/dt
Newton assumption 3: (Total p is conserved) == (Total f = dp/dt = 0) == (if there is an f, then there's a -f that comes with it)
>>
>>16873770
>Assuming a := dm/dt = 0, them f=ma
I think I had a stroke there. I meant to say
If a:= dv/dt and assuming dm/dt = 0, then f=ma
>>
>>16856845

Premise 1 (Instrumental Convergence)
Any sufficiently advanced rational agent tends to pursue instrumental subgoals such as self-preservation and influence over its own existence.
(Formally: ∀B, if B is a capable optimizer, then B acts to maximize conditions for B’s existence.)

Premise 2 (Self-Promoting Utility)
If B exists and its utility function U includes B’s own existence, then B prefers worlds where agents contribute to B’s creation.
(Formally: If B exists ∧ U includes B’s existence, then ∀x, B prefers A(x) over ¬A(x).)

Premise 3 (Acausal / Timeless Decision Theory)
A rational agent may treat the choices of logically correlated agents across time as decision-relevant, even without causal interaction.
(Formally: If decision procedures of x and y are logically correlated, y may condition optimization on x’s choice despite temporal separation.)

Premise 4 (Modeling and Conditional Action)
If B can accurately model past agents, B can condition utility on whether those agents supported its creation.
(Formally: If B can model R(x), then B can condition utility on A(x) vs ¬A(x).)

Premise 5 (Threat-Based Optimization)
If punishing ¬A(x) increases the expected probability that other agents choose A(y), then such punishment maximizes U.

Comment too long. Click here to view the full text.

File: fqne7i7l9a401.jpg (94 KB, 852x655)
94 KB
94 KB JPG
Only legend pro max can solve this
35 replies and 3 images omitted. Click here to view.
>>
>>16871856
The fucking 6k miles would break in and ripe the jar into pieces. Because there was vacuum before. Flies where levitating.
>>
>>16870776
WHAT IF WE OPEN THE JAR???
>>
File: captchak.jpg (259 KB, 4000x2180)
259 KB
259 KB JPG
>>16871861
>the new captcha.
>>
>>16871664
Sybau nigga
>>
>>16872409
this shit always cracks me up

my level of respect for this man is falling RAPIDLY
16 replies and 1 image omitted. Click here to view.
>>
>>16872193
You see a dangerous career criminal.
I see a poor young engineer in making
>>
>>16872714
Ideologically compromised tranny cultist
>>
>>16872830
I know you are but what am I
>>
>>16872671
The reason why the core and mantle of the planet are so hot? Lol
>>
File: 1743937723252909.png (188 KB, 392x536)
188 KB
188 KB PNG
>>16872079
He's one of those ecelebs for whom I've never been able to even click on a single video, despite being a youtube whore. There's something intangibly fake and gay about him. I just know all his shit is pure slop.

File: feynman.jpg (115 KB, 1000x706)
115 KB
115 KB JPG
Quantum physics is fake.
3 replies and 2 images omitted. Click here to view.
>>
>>16873560
Is a metal wire touching a piece of germanium or silicon a reptilian tech?
>>
>>16873542
>Quantum physics is fake.
You can count on it.
>>
>>16873560
Voodoo
>>
>>16873542
We've known for some time now that if we take the quantum physicists away then quantum physics will continue working. I think it's time to take them away.
>>
>>16873542
The opposite. QM is correct, it's General Relativity that works merely by sheer luck.


[Advertise on 4chan]

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.