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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] #### Janitor acceptance emails will be sent out over the coming weeks Make sure to check your spam box! [Catalog] [Archive] File: remarkable-tablet.jpg (14 KB, 510x383) 14 KB JPG What does everyone use to take notes? I keep seeing people using remarkable tablets (pic related). They look and feel really nice, but are expensive as fuck. I've just been taking notes on paper, but between classes, research, going to talks, etc, things just get too cluttered. 22 replies and 1 image omitted. Click here to view. >> >>10498099 The only issue with those is that you can wear out the screen quite easily and that they are bulkier than paper and pen. Perhaps in the future of rollable digital durable e paper that has color and is quick to switch pages will it make sense to take notes with those. I envy the students of tomorrow. >> I own a 700 Sony Digital Paper and still use paper and pen to take notes. I already failed for many memes, I am fast with the keyboard and can type LaTeX code while following the class, but still nothing beats paper and pen. >> I use a vintage thinkpad with latex in vim. For diagrams I snap a picture of paper notes with my phone and automatically insert the picture as a figure in my notes. https://castel.dev/post/lecture-notes-1/ >> >>10499755 Oh and I'm thinking of switching out the paper for a cheap chinese wacom-ish drawing tablet. Does anyone do this? Does it feel ok? >> >>10498099 Paper and pencil, sometimes I'll put down boxes in pen later to isolate and organize individual thoughts or concepts if the page gets too crowded. File: brainlet.jpg (28 KB, 619x453) 28 KB JPG >Struggling to follow during class 9 replies omitted. Click here to view. >> >>10499023 what is "theory" to you if not that? If you don't care about proofs you're not asking for theory, but brainlet-friendly recipes to manufactured problems. >>10499483 also this >> >>10499411 >realize months later how they were supposed to work amen brotha >> >>10499017 This happened to me during Stat. Mechs. >> >>10499017 Literally me since childhood. I have to learn on my own and it takes me a hell of alot longer than others >> >>10499693 >>10499411 Sometimes it takes time for an idea to truly ferment in your mind. What is going on with the concept of gender right now in our society? I think it’s great that it’s being talked about more and people (hopefully) aren’t as discriminatory as in the past. At the same time, there is a weird phenomenon where science and biology are sort of being attacked or ignored. For example, I’ve had people tell me that gender is completely a social concept, that it isn’t driven by biology, which is an absurd statement. I’ve also had people tell me there are no differences between male and female brains, which is of course not accurate. Why is it so popular right now to downplay any biological differences between men and women, and attribute them to society? Is it because if you can find a biological basis between genders, then people are afraid that it gives power to stereotypes? Because it’s not the biological differences that reinforce stereotypes, it’s sexism itself. 36 replies and 6 images omitted. Click here to view. >> >>10496909 >i have a womb. I menstruate opinion discarded >> >>10499517 Why are dresses and long nails feminine, Anon? >> >>10499517 Don’t be a jerk. >> File: uncle ted.jpg (214 KB, 1200x1200) 214 KB JPG >>10496866 >At the same time, there is a weird phenomenon where science and biology are sort of being attacked or ignored. Modern leftish philosophers tend to dismiss reason, science, objective reality and to insist that everything is culturally relative. It is true that one can ask serious questions about the foundations of scientific knowledge and about how, if at all, the concept of objective reality can be defined. But it is obvious that modern leftish philosophers are not simply cool-headed logicians systematically analyzing the foundations of knowledge. They are deeply involved emotionally in their attack on truth and reality. They attack these concepts because of their own psychological needs. For one thing, their attack is an outlet for hostility, and, to the extent that it is successful, it satisfies the drive for power. More importantly, the leftist hates science and rationality because they classify certain beliefs as true (i.e., successful, superior) and other beliefs as false (i.e., failed, inferior). The leftist’s feelings of inferiority run so deep that he cannot tolerate any classification of some things as successful or superior and other things as failed or inferior. This also underlies the rejection by many leftists of the concept of mental illness and of the utility of IQ tests. Leftists are antagonistic to genetic explanations of human abilities or behavior because such explanations tend to make some persons appear superior or inferior to others. Leftists prefer to give society the credit or blame for an individual’s ability or lack of it. Thus if a person is “inferior” it is not his fault, but society’s, because he has not been brought up properly. >> >>10499746 Yeah, I think you're projecting heavily here and attacking left-wing philosophy for your own psychological needs. File: 1521349744695.jpg (59 KB, 655x527) 59 KB JPG Redpill me on those aura photographies and the claim you can take a photo of people's auras. 7 replies omitted. Click here to view. >> >>10499493 >they seem to be replicable somehow So prove it by replicating them. >> >>10499551 It's not photographing souls, but yes, humans do have electromagnetic fields. Even plants do. What kirlian photography picks up isn't a ghost or your chakra or mana. It's the intersection of humidity, water content in tissue, ionization, gas discharge, pressure, voltage, and light surrounding all living things. The photos can be affected by everything from oils, sweat, electrolytes, water content, the surrounding atmosphere, pressure, and how well-grounded you are. Experiments debunk the hypothesis that they're evidence of a life force. Just electricity. >> The thing that gets me about Kirlian photography is that you can cut a portion off a leaf and sometimes the kirlian photo will show the entire leaf’s “energy field.” Wikipedia will tell you that it’s just water vapor left behind from when they picked the leaf up off the slide, cut it and put it back, but I’ve seen a video where they pick the leaf off the plant, cut it and then put it on the slide so the left-behind water vapor theory doesn’t hold water. Pun intended. Explain that shit, science. >> >>10499613 The cut dehydrates the surrounding tissue, just like cutting human skin. It also bleeds substances like moisture and various biological contaminants. Those have ionizing effects because the cells' contents have to be electric in order to function. Cutting a living thing is spilling water, fuel, electrolytes, and microscopic batteries onto a slide. >> >>10499636 >Cutting a living thing is spilling water, fuel, electrolytes, and microscopic batteries onto a slide. Shit may be spilling out, but that part of the kirlian photo isn’t an outpouring of “vapor” consisting of water, fuel or electrolytes; that’s the fucking leaf. Hi. I’m studying linear álgebra and have a test on linear aplications to diagonilization, next thursday. I have a good amount of time to study for it but I’m not undestanding a bit. I can’t seem to find a book that I can learn from and was thinking of starting from scratch using YouTube. Any tips or thoughts are welcome Thank you for your time >> >>10499702 http://joshua.smcvt.edu/linearalgebra/ http://www.math.brown.edu/~treil/papers/LADW/LADW.html File: Viewfromwarpspeed.jpg (22 KB, 380x253) 22 KB JPG How do we solve the speed problem? Are we really not going to explore space and see new worlds in our lifetime? >> >>10499460 I think we need more information. In time, the limitations we face now can probably be explored. A more important issue would be bringing the human life expectancy up to an indefinite time period, since that way all the other problems can wait. File: proxy.duckduckgo.comke.jpg (41 KB, 1200x600) 41 KB JPG What's your thought? who will accomplish what first? 30 replies and 2 images omitted. Click here to view. >> >>10498531 I believe this is what he's referring to: https://twitter.com/jeff_foust/status/1088088915771342848 >Blue Origin’s Cornell, talking about BE-4 testing, says the next version of the engine that will be tested soon will go up to 100% thrust, vs 70% of earlier tests. Basically, after nearly 2 years of testing BE-4 still hasn't been fired at full throttle; while Raptor was fired at 100% and beyond within weeks of first being mounted on the test stand. BE-4 in comparison has undoubtedly been fired many more times and for longer periods of time, but that doesn't change the fact that Raptor surpassed it's highest thrust output within a week of it's first firing, as 70% of 2400KN is 1680KN and Raptor has been fired at 1720KN and above. >> >>10499264 Firing at full thrust for 1 second means shit you fucking idiot. >> >>10499272 Still one second longer than BE-4 at full thrust, friendo >> >>10499638 If their engine survives 200 seconds at 70% thrust it can most definetely survive 1 second at 100%. >> >>10498218 If Bezos pushed Blue as hard and fast as Elon is pushing SpaceX they could probably pull ahead, as it stands SpaceX already beat them in terms of propulsive landing for both distance and mass landed and payload weight carried, they'll beat blue origin in manned flight assuming all goes well with the crew dragon. If they keep that lead there's not really any chance for Blue Origin to pull a Mars or Moon mission out of their ass. As it stands Blue Origin are still only flying their test platform while SpaceX has their starting rocket, heavy lift rocket, cargo capsule and soon a crewed capsule already flying, they're already sending up satellites and building test models of a much larger rocket that could dramatically alter humanity's space capabilities by giving us a relatively cheap reusable rocket with Saturn V-like lifting capabilities. I don't have any preferences for who gets more done, having more and more private rocket companies is great in my opinion and I hope both of them meet with the maximum level of success possible. File: okita-anri-4600517.jpg (1.09 MB, 1278x1920) 1.09 MB JPG Somebody give me the basic gestalt on /nofap/. I heard this was the board to go to for concrete answers. 70 replies and 11 images omitted. Click here to view. >> File: lonely.jpg (93 KB, 720x712) 93 KB JPG Abstract Based on the assumption that pornography consumption bears resemblance with reward-seeking behavior, novelty-seeking behavior, and addictive behavior, we hypothesized alterations of the frontostriatal network in frequent users. DESIGN, SETTING, AND PARTICIPANTS: In a study conducted at the Max Planck Institute for Human Development in Berlin, Germany, 64 healthy male adults covering a wide range of pornography consumption reported hours of pornography consumption per week. Pornography consumption was associated with neural structure, task-related activation, and functional resting-state connectivity. RESULTS: We found a significant negative association between reported pornography hours per week and gray matter volume in the right caudate (P<.001, corrected for multiple comparisons) as well as with functional activity during a sexual cue-reactivity paradigm in the left putamen (P<.001). Functional connectivity of the right caudate to the left dorsolateral prefrontal cortex was negatively associated with hours of pornography consumption. DISCUSSION: The negative association of self-reported pornography consumption with the right striatum (caudate) volume, left striatum (putamen) activation during cue reactivity, and lower functional connectivity of the right caudate to the left dorsolateral prefrontal cortex could reflect change in neural plasticity as a consequence of an intense stimulation of the reward system, together with a lower top-down modulation of prefrontal cortical areas. Alternatively, it could be a precondition that makes pornography consumption more rewarding. >> >>10499331 What constitutes pornography to studies like these anyway? Is it just any kind of porn or generic silicone thot humping or what? >> >>10484725 Best explanation of it that I've seen is from BAP, who argues that it's a sort of cargo cult that presumes it can get back an older form of masculine vitality from the pre-modern era. Problem is that it mistakes a symptom for a cause - animals breed once they have conquered space, it's another outlet for that vitality. Before that, they use it for conquering territory for themselves. In the modern era, there is no space to conquer, everything is entirely owned space, so our brains decide now is the time to breed. Trouble is, the current social setup also discourages the kind of coupling seen in the past, so while sex is freer, very often you have less chance to breed. For introverted minds, this works poorly, hence masturbation becomes the outlet for that energy. To put it simply: simply restraining your urges is a temporary, difficult fix. To actually solve it, you need to put your energy towards conquering something. I predict that expansion to other planets will drastically change this setup, you'll find the current degeneracy collapsing when people actually have something worth fighting for >> >>10495811 >>There are enough studies on why nofap is a good thing. And all of those """studies""" are by the same 4 people >> The average nofap retard: - religion and his contrarian parents told him that masturbation is a big no-no even though they did it too - he's usually a failure so he sometimes spends a considerable amount of time fapping. - His morals still tell him that what he's doing must be bad - He joins some echo chamber like the nofap reddit sub where he shares his experience with other retards - now motivated he tries nofap and it "works", because he also does other things to fix his life - he will never admit that he was the reason that he was a failure, instead he blames porn - he now lives with permanent boners and wet dreams every night because he's retarded like that Has the "out of Africa" thesis been overturned? Are we all Asians? 135 replies and 21 images omitted. Click here to view. >> >>10497883 This is brietbart tier cherry picking of a study they don't understand. Try citing the actual study and their actual words and you'll see why you're retarded. >> >>10492766 To think volume is a significant component of intelligence is a seriously disgenious and insulting perspective to brain function complexity. Women skulls tend to be smaller, for instance, while displaying the same cognitive competence as men on average. Grasping at straws and making a monument to a racist world view isn't science. >> File: another iq thread2.png (446 KB, 1262x846) 446 KB PNG >>10482539 >> >>10482629 >But the other homo species with which we're hybrids (except aboriginals) didn't originate in Africa. Neanderthals were European. Denisovan were asian All of them originated in africa, and ironically interbreeding between africans ("homo sapiens") and neandertals existed well before the neandertals disappeared >> >>10482539 If a white person has sex with a black person its statuatory rape. File: JPEG_20190216_150200.jpg (125 KB, 954x954) 125 KB JPG What does Gauss Jordan elimination mean geometrically. 20 replies and 1 image omitted. Click here to view. >> >>10495212 for some reason I thought this was about Jordan blocks and shit God i failed that class so hard. fuck jordan blocks and fuck jordan normal forms >> >>10495225 producing that 3by3's inverse >> >>10495224 Good one, anon. >> >>10495224 haHA! >> >>10496587 >The act of performing elimination doesn't have a geometric meaning. It is the same as using substitution to solve for unknowns. implying substitution doesn't have geometric meaning File: images.jpg (75 KB, 650x471) 75 KB JPG I HAD a friend who claims to be VERY intelligent. Scored exceptionally well in middle school and high school. Earned distinctions in some events organised by Nasa (a thing on extraterrestrial colonies). But is highly narcissistic. He says he is a Mensa member but still falls for cheap political PR campaigns. He aims to be a theoretical physicist. 3 replies omitted. Click here to view. >> >>10499022 You also do not as readily see the highly intelligent people that don't advertize their intelligence. Many people become skilled at hiding it. High intelligence (in terms of IQ) does not imply high achievements. It is not clear why that is so. And moderate intelligence does not exclude high achievements. That is why I think its more useful to discuss this in terms of achievements. >> These are people are trapped in the world of social signalling. Their accomplishments are only as good as they validation they receive. Knew a guy like this. He was obsessed with Steve jobs and Elon musk. Every conversation was just a hidden plea for you to acknowledge how smart he was. And he was decently smart, but not super smart. He seemed very irked that I was able to keep up with him intellectually. But I had no interest in fighting a ego battle so I'd just let him brag and not make a big deal out of it. The weirdest thing was even on topics which we agreed, he'd always try to contort things to the point where he would acknowledge that you understood, but you just understood the topic in a plebian way compared to his sophisticated philosophical take. Weird as fuck dude. Probably had a horrible childhood. >> >>10498929 Narcissism is one of the main coping strategies for people with aspergers (a diagnosis which requires above average IQ). Autistic behavior can often seem like narcissism while it's really better understood as social deficits related to autism. Narcissism in people with normal social skills is often (but not necessarily) a bit different from narcissism in autistics. >> >>10498929 >but still falls for cheap political PR campaigns intelligent or just a quick learner? if anything, quick learners are probably even easier to condition under the right circumstances. >> >>10499098 >my life, the post aw fuk bye ">biology" " >not science or math" pic related is the type of person who says this kind of shit 10 replies and 2 images omitted. Click here to view. >> >>10498024 >t. biolocuck >> >>10498148 >purity >not generality >> File: primorida.jpg (268 KB, 1428x648) 268 KB JPG >>10498024 No that's correct. Your field has been replaced with real science such as chemistry and physics. "biologist" is just another word for a low tier biomathematician. >> File: image.jpg (47 KB, 263x450) 47 KB JPG >the gay science >not about biology trash >> >>10498024 >pic related is the type of person who posts pic related ftfy any tips on how to write good lab reports? I'm an undergrad in the lowest bio class but these lab reports are a bitch for me >> >>10499430 Be concise and analytic in your writing. >> >undergrad >lab reports >lowest tier Literally just record everything, be precise, and interpret the results. Throw in a "what if we did this" and a "this may have affected the results" for good measure. Expand. Offer a different variable to test. >> >>10499430 yeah i could help you out (former physics lab TA here) but you're gonna need to be more specific. the most general advice i can give is to always write the core sections (procedure, apparatus, results, analysis, conclusions) and try to keep in mind that you are testing some hypothesis, so you should orient the lab report so that it represents a critical test of the hypothesis File: concave.jpg (5 KB, 211x239) 5 KB JPG Why is a berezin integral defined the way it is. I understand that [math]\int d\theta_{a}\theta_{b} = \delta_{ab}$ but I lack a good physical understanding of why this should be or even of what this represents physically. I hasten to add that I understand how it follows from certain formal requirements of an integral of grassmann variables, but I have no physical sense for any of this.
>>
>>10498457
>i need the physical interpretation
Just drop academia and go work a factory job
>>
>>10498948
My thought is that there should be a nicer way of motivating the berezin integral, to ask for some physical significance really isn't that egregious considering that this is physics afterall
>>
You kind of have to feel around to understand these types of things. A physical, visceral understanding of the math does not necessarily translate to a physical explanation of it.
Try doing transformations and plugging in odd and even variables so you can feel out how it changes the shape. Get a good grasp on how it can warp around depending on what polynomials/variables you pick and where the vanishing point is.
There. You have a visceral, "physical" model of it that you can feel in your hands and play with.
You can draw it out in your head with coordinates if you really need to, but really you're just treating it like a machine and seeing what inputs yield what outputs. Don't even worry about what it represents in regards to fermions or physics or whatever. Just understand the math and that yields understanding of the physical behavior.

Is it possible the universe was created because of entropy?
>>
Bump
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>>10498575
That's not how Hawking radiation works.
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>>10498575
Nothing happens “because of entropy” lol

Entropy is a statistical trend, not a first principle
>>
>>10498575
Virtual particles don't exist. It's just a story to explain the math behind Hawking radiation on a intuitive way
>>
>>10498575
THERE IS AS YET INSUFFICIENT DATA FOR A MEANINGFUL ANSWER

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