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/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.Use TeX with $tags for inline and [eqn] tags for block equations.Right-click equations to view the source.  05/04/17 New trial board added: /bant/ - International/Random 10/04/16 New board for 4chan Pass users: /vip/ - Very Important Posts 06/20/16 New 4chan Banner Contest with a chance to win a 4chan Pass! See the contest page for details. [Hide] [Show All] Please consider donating to help the victims of the KyoAni studio fire: https://www.gofundme.com/f/help-kyoani-heal [Catalog] [Archive] File: 1 plus 1.png (81 KB, 550x679) 81 KB PNG /sci/ humor thread 20 replies and 12 images omitted. Click here to view. >> >>10826078 what's there to get >> File: 1470579920387.png (344 KB, 1899x526) 344 KB PNG >>10826236 Mach 12 projectile. Considered seriously as a weapon that would be accurate? Mechanical target comps on ship were impressively accurate. But energy transfer accuracy to the projectile and air density energy absorption. It's fucking cool gun on paper and in proofing fire. But practical use for the upper limit is concerning. There's some mad-hatter in the future weaponry division, that convinced the check book board of knowledgeable faggots to pay up. Let's hope they don't learn of this guys persuasion stat. >> >>10826270 >>10826228 >>10826164 >>10826159 >>10826138 >>10826078 >>10826073 Are you non English speaking? Cause absolutely none of your incoherent ramblings are decipherable, extremely hard to read. You need to proof read them more or get a better translator or something. >> >>10826296 Well, here's the thing. There's tiers of English use. Remember Shakespearean English? Well, it's a fucking diverse language dude. Grammar and spelling? Ha! Falsehoods to make you incapable of decrypting information barely obfuscated from you. Legitimately though. You ability to read my posts are directly evident of you lateral and logical thinking ability. A upside down page should be harder. I don't meme nuggies you may need to sustain yourself with. >> >>10826035 BIG Laugh File: 1563678781128.png (172 KB, 727x682) 172 KB PNG >your school >your major & year >What do you think of the school and the program? What would you do if you could restart, knowing what you know now? 69 replies and 3 images omitted. Click here to view. >> >>10823743 IUPUI incoming EE freshman I went to orientation the other day and it was nice. I would've done better in high school if I had the chance to restart; IUPUI's more than good but it's not fantastic. >> >>10824077 Yes, as the only student to ever attend fuckstick university you would be pretty identifiable >> >>10823743 >dropped out in middle school >none >school is horrible, if I knew what I know now, I’d drop out sooner >> Simon Fraser University BSc Computing Science, 4th Literally the best in Canada >> >>10826273 Huh, didn't think I'd see another student from my school here. File: 20190303_000105.jpg (1.31 MB, 3264x2448) 1.31 MB JPG Horrible blackpill for any male hoping to go to grad school. Yet another reason to kill yourself if you were cursed with a Y chromosome. https://www.quora.com/Do-MTF-transgender-people-experience-the-same-female-privileges-as-the-people-born-as-a-female-of-the-same-ethnicity/answer/Peng-Peng-Zheng I used to know this physics PhD student in real life. She is a trans woman. She's not a pussy, she has been through a hell of a lot of tough experiences in life, such as being conscripted in an Asian military. When she had issues with matlab and sought help, this was her experience: Lost and clueless on a weekend, I decided to seek the other PhD students for help. Most of our physics PhD students are males, there are only two Chinese female PhD students including me. Everyone claimed to be busy, offering advice no further than ‘Go check your code again’. Most intense was a guy who used to be from the Computer Science department claiming that he knew nothing about Matlab. Then, just yesterday afternoon, feeling defeated after reporting to my professor without much work done, I met the former Computer Science guy and our only other physics PhD girl in discussion. It turned out that they just met up to discuss the same issue I had with Matlab, and everything took only an hour with the help of the expert. Pretending that I knew nothing, I asked if the discussion happened often. Apparently, this girl has received a lot of help from all the guys once and again. Some other males even drove down to her place just to help her with all her questions. I see other answers questioning the existence of ‘female privilege’. Let me tell you, female privilege is definitely there and we transgender women don’t really get to share that. Someone responded: Contrary to popular opinion girls have easier time during PhD, specially in Physics where there are few females. Profs go easy on them, boys falls over themselves to help them out. 17 replies omitted. Click here to view. >> >>10822376 I don't get it. If she got help and you are female, why didn't you get help too? >> >>10822395 >Females live life on easy mode until 30 here corrected it for you, after that its the opposite. That is why most trannies kill themselves around that age when they realize how shit it is to be an woman without youth and they aren't even real woman so its actually worse in their case. >> >>10825747 because the first faggot is a passable tranny, the seconf faggot isn't >> >>10822386 Don't do something based you're afraid what people will think, especially not mentally ill autists or mentally ill trannies. Stick to your principles. >> >>10822488 this guy knows lsd File: download.jpg (5 KB, 300x168) 5 KB JPG So, I failed Pre-Cal and Physics due to the fact I gave up every time I encountered difficulties. I haven't been shit at math before, but Pre-cal just gaped me. I couldn't understand shit in physics, and even when I asked for help, I couldn't understand. How do I study these subjects in the future? 3 replies omitted. Click here to view. >> I what the fuck is precalc? >> >>10824034 Don't read this shit, read your pre-cal and physics books. Did you try reading those? >> >>10824021 2=/=2.999999 2+2=5.98 >> >>10824628 elementary algebra, functions and trigonometry its 8-10th grade math in the states >> >>10824021 Every single expression contains symbols and some kind of logical connection. You have to know what each symbol means. You must understand each and every logical connection. For physics you must always know the units you are working with and try to imagine what they mean. You must always look at every single problem, and sit at every single problem until you do not properly understand it. If you have a hard time doing that, search for concrete applications. The biggest problem that people with mathematics have is that they do not understand that they really need to know each and every single detail or rely on their intuition. You will often hear the sentence "this just says", which it really does, you will have an expression, that will just say something, which you will later apply. File: Wohler_synthesis.gif (68 KB, 210x225) 68 KB GIF I do not understand why vitalism was ruled out by the synthesis of Wöhler, the Wöhler Synthesis does not explain the essence of life >> >>10825680 Wöhler Synthesis (190 years ago) was never interpreted by anyone to explain the "essence of life", whatever you may think that is. >> >>10825680 >only biological systems make organics >oh wait nvrmnd I can make piss in a flask >guess we can make organics >> >>10825680 Vitalism is the domain of religion. It was believed by pretty much everyone, the 'breath of life'. Probably has animistic origins. The most reduced form is human-only soul. Tell me why this would have relevance to a logical-empirical tradition like science? File: 7Kc6KGmCAlqfCu9Ss.jpg (125 KB, 800x586) 125 KB JPG Why pictures from the moonlanding are so high definitive, while the videos are trash? 2 replies omitted. Click here to view. >> File: LQBait.png (103 KB, 420x420) 103 KB PNG >>10825966 >> File: Pfost_Ampex_Fig-23.jpg (122 KB, 1200x873) 122 KB JPG >>10825947 taking bait At the time you either had film cameras(stills or motion picture) which had to be developed in a dark room, or TV video, which had the benefit of being able to be broadcast-able over radio waves, but hugely inferior quality, and the only way to record them at the time was literally filming a TV screen or a giant expensive, room size VCR. So all the live TV broadcasts look like this https://youtu.be/TmHABUfjYPI?t=254 and the later developed films look so much better. https://www.youtube.com/watch?v=Iwn4LVVvAUQ All those films and pictures of them landing and walking around had to be brought back to earth and the film developed in a dark room. The was not just true of the moon landing but for everyone. People brought cameras to places and when they got home had to get the pictures developed before they could actually see them. Recording high quality TV video wasn't really possible until around the 1970s and not really affordable to consumers until the betamax and VHS came along. https://www.youtube.com/watch?v=KfuARMCyTvg >> It's a good thing those early cameras, both video and still, were of poor quality. The photos from the latest moon probes show it to be about as interesting as a gravel parking lot. The blurry video left much for the imagination. The still photos of the 60s were much higher quality than the video but still poor by today's standards. >> >>10826050 What the fuck could you have imagined was being obscured by blurriness? >> >>10826157 moon rocks. File: 1554101546194.png (233 KB, 640x480) 233 KB PNG I have to be honest, I've taken Calc III and Differential Equations, and I have no idea how the author got line 2. What am I missing? I don't know how to work with the fractional part function in a calculus setting 1 reply omitted. Click here to view. >> >>10826154 Can you at least provide something constructive and not just shitpost? >> Integration by parts bro >> >>10826127 the fraction doesn't effect anything? it just carries through? >> >>10826127 On the interval [math] [k, k+1]$:
$(x - \text{floor}(x) ) - \frac{1}{2} = Ax+B$
Boundary conditions:
$kA + B = - \frac{1}{2}$
$(k+1) A + B = \frac{1}{2}$

Solving:
$A = 1$
$B = -k - \frac{1}{2}$

On the given interval, the integral becomes:
$\int_{k}^{k+1} [(x - \text{floor}(x)) - \frac{1}{2} ] f'(x) dx = \int_{k}^{k+1} [x- (k+ \frac{1}{2})] f'(x) dx$

The rest in just integration by parts .
>>
>>10826174
Thank you very much

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Uploaded Color Mod 1.87 for the "famous" :P evolution simulator Biogenesis. :)

The "Color Mod" (created by myself) is an extensive expansion (semi-official) for the original simulation made by Joan Queralt.

You might like it, if you are interested in evolution and/or virtual ecosystems. You can interact with the world, you can also try to create organisms yourself, that hopefully (creationists up for the challenge xD) outcompete organisms made by natural selection.

Biogenesis is completely free to play and you can download it here:
https://sourceforge.net/projects/biogenesis/

Main download includes the vanilla version 0.9 (bug fixes for 0.8) and two mods (mine ist the Color Mod).

Discussion boards:
https://sourceforge.net/p/biogenesis/discussion/
https://old.reddit.com/r/Biogenesis/

1.87 changes (compared to 1.86):

Have fun :)

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These retards are too busy worrying about mexicans to even discuss upcoming energy crisis, food crisis, population crisis, and AI crisis. These are problems that will become a REALITY soon, and these fucking idiots in charge haven't even STARTED to discuss them in any meaningful way, let alone come up with any sort of plan.

We are completely and utterly fucked aren't we? Do we as Americans really have to sit around and wait for Silicon Valley to take control of the helm and become a fascist technocracy to save us from ourselves?

>>
>>10825943
not science or math.
>>
>>10825943
Unfortunately most people haven't come to think accurately about the control structures that drive most world events. There are reasons we aren't allowed to solve our problems.

There are also reason they clamp our umbilical cords early, vaccinate, then brain drain from everywhere else.
>>
>>10825943
>AI crisis
lmao

The "US" is going to be fine, it's Us that are fucked. "Daddy Elon" and his kind are just soaking up some popularity playing hero while positioning themselves to seize more power.
>>
>>10825943
Several billion of the poorest people on the planet would relocate to the United States of they could. That what "worrying about Mexicans" is really about. All of the concerned you listed other than AI would become civilization destroying problems if the government stopped "worrying about Mexicans" and allowed everyone who wants to come in to come in.
>>
>>10825943
Silicon valley is liberal. You rural suburban retards are on your own.

brainlet here...a-are new antibiotics being created r-right!?

I don't wanna die from super strep or gonorrhea
>>
>>10825918
no
the antibiotics of the future are nanomachines. Anything else is effectively a band-aid that retards who abuse antibiotics use to turn normal bugs into super AIDs
>>
>>10825918
>I don't wanna die from gonorrhea
don't have sex
>>
>>10825918
Bacteriophages or nanobots. Can please have a ban on this topic? Everyday we a thread worrying about antibiotics, but it's a complete non-issue.

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>mathfags care about shit like their Erdös number
>or their “mathematical genealogy”
>claim to study pure truths in a universal language with their intellects
What a bunch of weirdos.
>>
>>10823672
By definition, within mathematics, every theorem is true. Outside of mathematics, it's not necessarily true, but I don't think we've every had a pure mathematical theorem get proven false by a field outside of math. So no, math is entirely about truths.
>>
[/math]\infty[/math]
>>
>>10823672
>formalism
got btfo a million years ago, get with the times gramp it's all platonic
>>
>>10823704
first of all,
>By definition, within mathematics, every theorem is true.
isn't correct
the double turnstile https://en.wikipedia.org/wiki/Double_turnstile A ⊨ phi is pronounced as "A models phi" or "phi is true in A"
and this is the only instance I know of where the word "true" is given a precise mathematical definition (in https://www.amazon.com/Shorter-Model-Theory-Wilfrid-Hodges/dp/0521587131 for example)
this precise mathematical definition simply uses the word "true" and has nothing to do with truth
second of all, you haven't said which theorems
>every theorem
refers to
third, you're using "true" in a way such that something can be true inside math but not true outside math, but I don't know what this means, nor can I think of any example
fourth, the first sentence refers to a definition of the word "true", not what truth refers to
fifth, you make the conclusion that because mathematicians have created a definition of the word "true", therefore
but this doesn't make any sense because what is meant by truth is not the same as what is meant by ⊨
>>10825530
Math is formalism.
I'd modify OP as follows
>claim to study correct derivations / proofs in a universal language with their intellects
since this is what math students learn

>>
>>10825697
None of this is consistent with the hero worship in mathematics. Even naming formulas after people who prove them is pleb tier.

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I bought the textbook for my modern physics class next semester early. Right now I'm reading about time dilation and length contraction. One example deals with a rocket moving at 0.9c toward a star 4 light years away. From the earth's perspective, the trip would take 4.4 years. However, confusingly, the trip from the rocket's perspective, the trip took 1.9 years. This really confused me initially, because that means that the rocket would be moving faster than light. But I thought about it more, and I think that this is possible because the actual distance was contracted, so the rocket only really travelled maybe 2 light years from its own perspective.
Is this accurate? I'm just trying to wrap my head around this. I came to this conclusion because the problem is similar to atmospheric particles somehow making it to the earths surface in spite of their decay times.
>>
>>10825795
Elaborate?
>>
>>10825795
back to >>>/x/

>>10825489
don't listen to that guy. your understanding is correct. from the rocket's perspective it is moving 0.9c relative to the star, but the length appears to be ~1.74 lightyears not 4 because of length contraction, giving you the 1.9 year trip time
>>
Your textbook is shit if it doesn't clarify. The starting point of special relativity is that the speed of light is constant for all observers. This is, in the theoretical development, a postulate which is taken as truth. It makes no sense from a classical perspective, because it's a fundamental change to the usual classical assumptions used in classical physics. So the answer in relativity can never be that some physical object managed to move faster than light, and if you get this result, it's a great way to see if your calculations are wrong. Length contraction can be seen as a simple application of this because both observers would agree with the velocity of the light and so time and lenght should change accordingly. It's really tough conceptually, so the point of these examples are to break from our usual classical intuition. Lenght contraction in particular shows a profound result, the notion of euclidean length, which was a fundamental physical observable in Newtonian physics, it's now an obeserver dependant parameter, and therefore no longer a physical quantity. It became a useful cuantity like the position of an object relative to an observer.
>>
>>10825489
The textbook example of your mother's vagina comes to mind, OP. My cock is moving at 0.9c towards the end of her pussy 4 light years away. From your perspective, the insertion would take 4.4 years. However, confusingly, from my perspective, the trip took only 1.9 years.

The zinger is that the actual distance was contracted, so your mother's vagina was only broken in to about 2 light years in length.

Anyways, yes, the length is dependent on the frame of reference, because the speed of light must hold.
>>
>>10825903
>her pussy 4 light years away.
sounds about right, thats as close you ever gonna get near womans vagina.

https://arxiv.org/ftp/arxiv/papers/1707/1707.00934.pdf

"For about a month, the scientists beamed up millions of photons from their ground station in Tibet to the low-orbiting satellite. They were successful in more than 900 cases.

“This work establishes the first ground-to-satellite up-link for faithful and ultra-long-distance quantum teleportation, an essential step toward global-scale quantum Internet,” the team said in a statement, according to MIT Technology Review."
>>
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>>10825915
I should mention this is from 2017
>>
finally

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This might sound like a silly question but in terms of energy efficiency how efficient are animals when compared to robots? Let's frame the question in the form of the ratio of total energy intake over the competitor's lifetime versus the amount of newtons of force it generates from birth to death. The energy spent on, say, maintaining a drone counts against it, as does the energy cost of extracting and refining the fuel it is fed. The competition ends when one of the two competitors dies.
>>
>>10825624
If you could fabricate a new species of animal to perform exactly the task you would design a robot to perform, the animal would generally be more energy efficient.
Cells are basically nature's nanomachines, after all.
>>
this robot is p robot is probably driven by a 15 horse power two stroke go kart engine

a regular horse is one horse power and does the same thing.

Horses use less horse power to accomplish the same task, therefore horses are more efficient.
>>
>>10825624
The human runs on less equivalent power than a light bulb.
>>
>>10825632
I always wondered wether it would be smarter to train chickens for weeding or develop an weeding bot. Or a bot that trains chickens.
>>
>>10825883
goats are GOAT weeders

And primes the Christian pure untouched virgin girls of numbers?Do primes have a secret side by which they are actually even more massive whores than anti-primes in which they are addicted to number cocks and want to suck everyone's dick every time while having to keep a charade of being pure?Also, in this universe, which number should have the biggest dick to be sucked by number-whores?
>>
>>10825837
Fucking hell, how horny are you right now?
>>
>>10825840
You are telling me that you have never thought of probably the BEST FETISH in the world????
You have never wondered how many 1s a 0 could take or if 8s and 11s should be legalized?
My man you have been mossing a lot
>>
>>1082583
You need therapy
>>
This thread is certainly interesting, shit, but interesting

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