/math/ i keep on getting these hilarious captchas, this can't be random. they gotta be seeding the randomness that creates the captchas with memes, is there a mathematical way to prove it?
>>13772109There is definitely a bias towards some characters and not others. How often have you seen an E, B, 7, F, etc? There's some limited subset or at least some bias here, which could lead schizos to wrong conclusions. There's also a seemingly higher than expected incidence of repeated characters. I dount they're pulling from a random bag of all symbols
>>13772490>There's also a seemingly higher than expected incidence of repeated characters.i noticed that too, seems like it could be taken as further evidence of memes in the seeding
>>13772490It seems like with characters that have look alikes they only use one of them. Lots of V but no U lots of 0 but no O
>>13772549 its almost as if it were designed to appeal to midwits who have low confidence in their own perceptive abilities.
>>13772107I was also asking myself if the captchas of scihub were random or not
Books EditionTalk about mathematics, last thread was >>13742383Some people here and there wanted book recommendations, so I made a short list where anyone is welcome to add to it (as long as they're not a spaz about it). It's more algebra-oriented, so it definitely needs additions. If it gets long enough, I'll put it in a pastebin.(If there's no title, then title = subject)Proofs:-"How to Prove It", VellemanCalculus:-SpivakLinear Algebra:-"Linear Algebra Done Right", AxlerSet Theory:-"Naive Set Theory", HalmosComment too long. Click here to view the full text.
what did lang mean by this
>>13774671this is so obvious it hurts. [math] t^2(x+1)^2 = y^2 [/math][math] x^2 + y^2 = 1 [/math]
>>13774732i was trying to expand t^2(x+1)^2 to get 1-x^2
>>13772233Modeling and IPC Control of Interactive Mechanical Systems A Coordinate Free Approach
>>13772320That's not something anyone here can give you a meaningful answer to. Pick rigorous books and work hard.
Human waste 1/3 of their life sleeping. What if, you can sleep but at the same time, you are not sleeping? I mean, you can use your "sleeping time" to study instead. Is this bad for your health anon?
>>13771091The brain is a computer
>>13771091> wasteslave mentalityfree men enjoy sleeping comfortably as long as they like.
>>13771091>to study insteadlmao. you aren't thinking right when you are dreaming. I had a dream I finally solved this PDE i was working on, and I made a point to remember it. Needless to say as soon as I woke up and thought about it I realized it was complete fucking gibberish that didn't even obey the product rule.
https://www.google.com/search?channel=trow5&client=firefox-b-d&q=best+age+to+learn>According to the study, the best time to learn a new language with native-speaker proficiency is by the age of 10.>I quit school exactly at the age of 10 because my parents think education isn't that important>"If we can survive without basic education, why can't you, anon? hurdurdurdur">Already wasted 19years of my life doing stupid shit29 years old asianon from shithole country here with elementary level English.Is it too late for me to self study web dev, English language and Algebra?And I think I might have ADHD, too.Oh god. And I don't wanna work on contruction job anymore. Not in this country. We got paid peanuts, man.
>>13771133Just because you're lucid doesn't mean you can do everything. I can do very little when I achieve a lucid state. I can often fly, but not change my appearance or manifest shit out of the ether.
Get the fucking vaccine.
>>13774341No lol, try to put a needle near my arm, you get shot. Simple as.
>>13774341Do you call oats "horse food" as well, you dumb redditard?
>>13774650Well it appears that they want us to starve to death if we don’t get the vaccineAlso you wouldn’t do shit if they actually forced you to get it
>>13774341I've never taken a flu shot and I'm not going to start now.
>>13774372>>13774412>>13774430>>13774650>>13774790>>13774758>Yeah i'm an antivaxx, covid-willing bitch. So what if i harm others by transmitting to others. It's called """'freedom""" and they should thank me for it even from their graves.May the covid gods take you all from this plane as quickly as possible.
When I get about 6-8 standard drinks of alcohol into me I get a tingly feeling on the bottom of my feet. It goes from the base of my toes to my soles. It is slightly pleasurable.What is causing this feeling?
>>13771375Alcohol is a mild NMDA receptor agonist. when you drink enough you can start to feel some anaesthetic effects (numbing of extremities in your case)
>>13771375>>13771399Alcohol is a vasodilator, so it could be that it's opening up your blood vessels in your feet making them feel warm and tingly. Do you normally have cold hands/feet or circulation issues?
>>13771375you're addicted to a drug and so it makes you feel better when you take the drug that you're addicted to.
>>13771375Back when I was a 750ml-a-day alcoholic I'd get home from work and chug roughly 7 shots in just a few pulls and chased it with water. I remember I'd immediately start sweating, before the warm embrace of liquor set in. But that initial sweat was quite pleasant. Not sure what my point is, just nostalgic since I practically don't drink now. Thank heaven, alcoholism sucks so much
its called the groove and you are supposed to dance
By weight/amount compared to other recreational drugs. i tried posting this on plebbit askscience but it was immediately removed for 'safety', maybe i had a comment on one of the "bad" sub reddits before and therefore my questions are potentially unsafe to view.Most recreational drugs are active anywhere from the microgram range e.g. lsd to the handful of gram range e.g. phenibut. most drug doses are around 1mg to 500mg. But an alcohol/ethanol dose for a recreational effect is usually at least 25,000mg e.g. for a pint of 5% beer. A bottle of 13% wine has almost 80,000mg of ethanol and that for many might be a moderate-ish recreational dose. You could easily consume 200,000mg on a night out and not be too drunk. I've read that LSD has a very tight binding on the receptor it is an agonist for which is one reason why it's potent. Phenibut has doses in the 1-2 gram range, I've heard only a fraction of the of the dose ingested reaches the brain and it also has a lower affinity for the gabab receptor than baclofen, a drug with similar effects as phenibut but active in the tens of milligram range. Gabapentin does can also go fairly high, but typically in amounts an order of magnitude below ethanol doses.What's up with ethanol, why does it take so much, volume wise, to induce recreational effects compared to many other drugs? I heard ethanol affects many receptors, often some of them being downstream as a result of a primary effect e.g. on the GABAa receptors where it acts as a positive allosteric modulator, and also as a result of antagonism on the nmda receptors. I've looked up other drugs that act as allosteric modulators on the GABAa complex but they are active in the <200mg range, although I do understand different drugs have different effects on the GABAa sub-types and there are lots of different sub-types so it might not be a straight forward answer.
>>13771478The lethal dose of alcohol is way closer to the effective dose of many other drugs, it is true that is lt is way harder to overdose because you'd pass out before consuming too much but it is by no means safe.
>>13771988https://www.youtube.com/watch?v=4ikH9ZRcF2Qhttps://www.youtube.com/watch?v=CSM3x9G7eTQThere's plenty of animals drunk from fermented fruit vids out there, but these animals also weigh next to nothing to begin with.
>>13772057Nice. It seems the ADH enzyme is conserved among many animals although not sure if it's primarily just for ethanol. It says yeast had a good system for a while with their waste product being rather toxic to other living beings, but lucky animals got a mutation that allowed them to metabolize it in a series of steps(???) and the chad ish boozing animals lived long enough to get drinker stacey and becky animals drunk enough but not dead to have sex with them... obviously.
>>13769822>What's up with ethanol, why does it take so much, volume wise, to induce recreational effects compared to many other drugs?its kinda of a "why is the time constant the number that it is, instead of another number"It takes so much, volume wise, because it's affinity is low. > I've looked up other drugs that act as allosteric modulators on the GABAa complex but they are active in the <200mg range, although I do understand different drugs have different effects on the GABAa sub-types and there are lots of different sub-types so it might not be a straight forward answer.Yeah this is "key-and-lock" hypothesis of sorts, right. For any receptor, your molecule needs to be the right "shape" to bind in the pocket. The closer the ligand/molecule is to the correct shape, the better the binding constant. This is really watered down as there are certain effect I'm ignoring, but the basics are true.Some molecules are less close to the pocket-shape than others, and still bind, but weakly; the molecular forces means it only occupies the pocket for a small amount of time compared to another compound. LSD is on the other side of the extreme; insanely small amounts are needed, and part of that is this cool mechanism where, after LSD binds to the receptor, it forces a "lid" to be locked down over it's receptor.But mostly, ethanol is a weak ligand because it's shape allows it to bind to the receptor, but weakly, and thus large amounts of it are needed to overwhelm the receptors.Interestingly, despite its deep cultural meaning/history and research on it, alcohol is fucking hard to get any straight answers out of because you basically have to flood the whole goddamn system (brain) with ethanol, making isolating effects of alcohol very difficult to do. This is mostly because the more you flood your system with, say, a random compound, the more likely it is to "bind" to something it normally wouldn't because of the overwhelming number of them.
>>13772003bitch sobertard
If CO2 really is causing global warming and its humanity's job to control the CO2 level so that global warming doesn't become catastrophic, what should the CO2 level be? Given that we're capable of controlling the CO2 level, there should be a preferred target number to aim for. My own opinion is that the planet's overall carrying capacity for carbon based organic life probably maxes out at about 1500ppm, so thats where I think we should peg it, what does the rest of the the hacker gang known as anonymous think about this issue?
The real reason they keep talking about climate change is because they want to depopulate the planet through some genocidal means and this is simply their attempt to provide the justification for it.
>>13774137I don't think they could even if they wanted to. Seriously, how would they do it ?
>>13773251/thread
>>13773230I'm sure it's a factor but we always seem to ignore everything else we do that directly generates heat. Basically everything that uses electricity is generating heat. Hell we're all driving around in cars with engines running close to 100°C. There's also like 8 billions of us, that's a lot of body heat. As population density increases so do temperatures in that area. A small city is almost always a couple degrees warmer then a rural house a few miles from that city.
>>13774773Ayy lmao. So the rise in temperatures is just that """there's more humans using hot things""". This is the worst denialist garbage take i've seen so far. But Dunning Kruger loud mouths always find a way. Do tell, you are like a 15 year old zoombot aren't you?
Why are Neanderthals and homo erectus considered different species if they’re able to produce viable offspring with humans?What other reason do we have for calling them a different species?
>>13774765Just wait another 5 years until they are reclassified as "races" and the notion of them being separate species is holed out of ideologic congruency.
>>13774765Just wait for more schizos and dumbfucks like >>13774768 to """think""" for you OP. A simple, god damn 2 second google search is clearly beyond your cognitive ability.
is there a scientific reason? assuming many alien civilisations exist what would be their interest in surveilling relative primates like us? why not just colonise us?ive seen recent documentaries suggest that earth is a source of tourism for ETs because it is a rarity in the known universe - for its diverse and beautiful landscapes, flora and fauna. the documentaries also suggest ETs have a vested interest in ensuring humans protect the environment for this reason. how accurate may all this be?
>>13771751They're not >>>/x/
>>13771772https://www.bbc.com/news/world-us-canada-57559179
>>13771751Honestly aliens probably go all over the place to multiple planets. But why would you waste time flying around barron wastelands or ice tundras when you can fly around earth
>>13771751Naturally occurring garden world that developed sapient life would garner some interest by a spacefaring civilization
>>13771751When I explore in elite dangerous I breeze through hundreds of desolate systems with just icy bodies and gas Giants. Often, I don't even bother visiting planets.When I find a system with indigenous life, or is Terra formable, I stop by and check it out - scanning diligently. Then, I leave. There is always the next system, more to see.I would imagine they probably do the same, there are probably more interesting things to see. Wouldn't make much sense to stop and fiddle around with a planet when there is far more to explore.
I recently bought some Mattel He-Man figures from a Dollar Tree and I wanted to ask if it is safe to put on a bookshelf in my room. I have read online that plastics break down over time releasing harmful chemicals into the air but this is a Mattel brand so I don't think it'll be as bad. I recently purchased an air filter so maybe this will help too?
>>13772377room temp plastic emits fuck all for VOCs, the co2 you exhale accumulating is a much bigger safety hazard, proportionally speaking. run a 3d printer in your room and maybe you could pass dangerous concentrations with extremely poor airflow. any finished and cured plastic product effectively emits no VOCs
>>13772403This was very reassuring, thank you
>>>http://tohno-chan.com/fig
>>13772377Depends on the plastic. The amount of time it spent on the shelf (in the store, shipping, warehouse, etc.) should permit enough time for outgassing. Chances are it is a thermoplastic, not a thermoset. Generally (unless it is pvc) these are free of plasticizers, which chiefly constitute the VOCs cited.Also fun fact, the "new car smell" is just plasticizer. It's all so tiresome.
>"alien" character in film/tv>it's humanoidwhat are the odds of this even being true?
>>13770762>what are the odds of this even being true?what are the odds that the kikes in hollywood are so dimwitted and incapable of original thought that it isn't possible for them to conceive of any other alternatives?
>>13770762Odds for aliens roughly around our level of intelligence/development being vaguely humanoid isn't crazy because of convergent evolution and whatnot, but it's incredibly unlikely we'd ever meet that kind of aliens. Relative to the age of the universe, technological development and even natural selection (past a certain point at least) is very fast. Thousands of years is nothing on astronomical scale, so the gap in evolutionary/technological being around that level would be a bizarre coincidence for any aliens we'd run into. And aliens that are millions of years more advanced would've transformed themselves technologically into something completely different, for sure.
>>13770780how ya doin took
>>13770762High. It's called convergent evolution
>>13771763i can't breathe
Well?!
rabbits are just large rodents but they are kind of like ... "heart" while the other rodents could be soul - though thats just bias from watching watership down as a kid - meaning>if you set a dog on a rabbit, itll run away from its babies to increase their chances of survival while an adult mouse would reproduce more and send the children out into the risky areas - and, in better situations, leave them behind after scaling as a check for resources coming back >if you make the sound of a dying rabbit, rabbits will stick their heads and ears up to see where the danger is coming from while a hundred mice would die for the nest by walking into the traps other mice have died from they are just "heart" rodents
>>13774711Based schizoposter
ackqtually i was raised around rabbits when it comes down to it, when what the rabbit is - whether its "heart" or "soul" - cant face the last problem, it leaves behind a skeleton theres even one inside you right now!
>>13774740>theres even one inside you right now!What I stick up my ass is none of your business.
>>13773422>This is how reconstructive illustrations work>Trust me, i am reposting it from facebook>>>/x/
>”“Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality. ”Was he right? I personally think so, at least partially. Tesla did not employ mathematical analysis in his work, he simply had an extraordinary ability to visualize things in his mind’s eye, especially the aether (classical electromagnetic field), and look at what he accomplished. Yes there is a place for abstraction and mathematical analysis but these results should be backed by real, experimental results.
>>13767859its la chancla,(or chancleta) not clanchaanyway you are 100% right, that quote is Tesla jsut seething because he got filtered by physics past classical electromagnetism and mechanicshe was a 19th century brain
>>13771009>>13772902slavaboo btfoPAESANOS ONLY
YES I IDENTIFY AS A SUPER SYMMETRIC PARTICLE. YES, MY FURSONA CAN ONLY BE DETECTED IN A SUPER COLLIDER OF AT LEAST 100 TeV
>>13772902Anderson's spanked it
>>13765545>Albanian Are you fucking kidding me? You fucking dog, You absolute dog. DO NOT claim a pure blooded Croatian BVLL to be an Albanian. You should be grateful I'm even uttering the name of your people, which let's be real you are an Albanian pig. You are a fool, a coward AND A bitch. You would most likely get shot on sight if you so much as to dare step foot out of the animal enclosure of Europe (ie: Albania). I'm actually surprised you can form a coherent sentence considering you a practically closer to a chimp than a human, as are all Albanians. You're lucky I don't dox you you fucking rat, consider this a warning.
How do people succeed in college?
Bump
Hell if I know, I'm barely scraping past
>>13772330Youmemorize info and then you vomit it on the exams
>humanitiessucking the professor's cock>STEMhoping the professor curves the grades at the end of the semester
Cheating is rampant everywhere, most don't discuss it and never get caught.
Since other sperms raced to get to the egg what were the odds of me being born?
>>13774027100% percent because you were born
>>13774100What about all the other sperm cells?
>>1377413525% chance of being born because we don't know if you were twins or not
>>13774166I'm not a twin
>>13774027The average male releases between 40 million to 1.2 billion sperm cells per ejaculationBut you also have to factor in the fact that each ejaculation contains different sperm, each menstrual cycle contains different ova, all of the different combinations of people who could have had sex in the world and the different times they could have had sex too.If your dad had hit a red light on the way back from the movie theatre or decided to have dessert the night you were conceived it's almost certain a different sperm would have fertilised your mother's ovum and you wouldn't be here right now.
