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/sci/ Science & Math

Threads added between 2014/01/27 22:00 and 2014/01/28 04:00

Proof that 0.999... = 1

40 more posts in this thread. [Missing image file: jq3pkqF.jpg]
I hope this settles it once and for all.


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Nootropics thread? Nootropics thread I was browsing the sticky and came across the nootropics section. One thing that notably stuck out to me was this like >>Suggested combo by Anon: 1200mg Pramiracetam + 800mg Alpha GPC + 12mg Galantamine [citation needed that there are no adverse drug interactions here]. Anon said that this gave them "near eidetic memory." I have no experience with nootropics, or any drugs besides caffeine really. Have any of you guys tried this stuff? And what kind of results have you gotten? From my understanding the only really worthwhile nootropic are Amphetamines, but they have their obvious downsides, like addiction and potential brain damage if abuse. My research on racetams seems to have mostly anecdotal evidence. Some people say they do absolutely nothing, and others claim they have a substantial effect on memory/cognition
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http://en.wikipedia.org/wiki/McCollough_effect is the McCollough effect real? im scared to look for too long since im a graphic designer
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You are the first person to walk on the surface of Mars. What are your first words?
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Are all ideals of \mathbb{Z} of the form an f*n, where f is a fixed element and n runs through \mathbb{Z}? (I think the answer is yes and relates to Euclidean domains, but I really don't know.) More generally, in a polynomial ring k[X], are all ideals generated by an expression f(X) in the above sense? More in the analytical direction: Is the occourence of the expression \sum_i^{N}\ f_i\ n_i in the Barns zeta function http://en.wikipedia.org/wiki/Barnes_zeta_function anyhow related to the fact that these expressions give you ideals? More in the algebraic geometry direction: Does the set of ideals of the integers give you a space? E.g. the ideal generated by 2 contains that generated by 4. The space I talk about hence, composed of the spectrum might be the terminology (I don't know), "leaves out" certain elements and then might have a funky structure. Is that a reduced version of Z itself? More in the categorical direction: Should I always think of a structural homomorphism \phi: S\to s as being itself an S-object in s. (I see these S-objects "live" in s in an even more reals sense than the example I always though about so far: trajectories or fields interpreted as generalized elements in the category of sets.) --- off topic: Is Hindley Milner a typical type system, or is it more on the exotic side? http://en.wikipedia.org/wiki/Hindley%E2%80%93Milner_type_system Can someone give a concrete example oto where the prossibility for type inference might fail? Is it possible to have a system where type inference fails to be possible, but can be resored by adding a library for certain expressions?
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Heyo, does anyone know what other values are excluded from the domain? So far I have 3, -4, and 7 and I think there are two more. Thanks for your time!
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I fucking love you /sci/. You're the best and most autistic shitposters in any board in any chan I ever visited. No body feeds trolls better than you and no where does the same same horrible trolling bait so many people for so many successive months or years (evolution (just a Gauss), sun of ice and fire, 0.999....=1 (Oh this fucking one), 1+2+3+4...=-1/12), no where do mods delete a math grad student asking for advice on job placement in 5 minute and leaves a Jacob Barnett, Evolution is geuss and three IQ threads live for more than a week. Never change /sci/.
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Black holes? Please. http://www.techtimes.com/articles/2950/20140127/there-are-no-black-holes-stephen-hawking-stuns-world.htm
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What's the best way to produce massive amounts of bacteria, for the purpose of having them produce certain desired chemicals? No industrial equipment that I'm aware of can do this, does anyone have any knowledge of this kind of equipment? I'm talking something that can make kg's of a cellular chemical product, I'd imagine it would have some large growing tank, and the closest I could think of would be like brewing vats of some kind. I'm interested in varying types of cells that I may be able to grow, which may be profitable if I can extract and purify the chemicals they produce naturally.

Eudemonic game theory

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Let us say that you have been captured and threatened with torture. You are, for whatever reason, entirely willing to betray the information you hold. Your primary goal is to avoid pain, and perhaps you positively want to squeal. How should you present what you know? I see a few options: 1. Break down immediately, beg for mercy, humiliate yourself, and spill the beans. (If you talk right away, will they torture you anyway? And since no further good information can be offered why should they stop?) 2. Go in acting tough, really tough. At the first sign of serious pain, start crying and switch to strategy #1. 3. Wait until they apply their "best shot" torture, and then talk. They will feel they have done their job and stop. 4. First offer (or make up) compromising information to show your disloyalty to the cause your torturers are fighting. Your confession will then be more credible. 5. Say you don’t know anything, try to fight the torture, but break down when you can’t stand it any more. You can’t fool them, so the best you can do is to actually "go through the wringer." You are stuck in the pooling equilibrium, and trying to deviate only makes you worse off. Which of these is the most credible signal that you have told all you know? Can you do any better than number five? And how does your best answer depend upon the hypothesized motives of the torturers? Is there anything you can say to the U.S. to avoid being sent out for rendition? I do’t see any simple answer here, the question is which behavior your torturers will interpret as an unlikely tactic from a truly determined trickster.
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yo, /sci/, real quick question for some chemists out there. I plan to synth some benzaldehyde, does this pathway make sense? >toluene + kmo4 equimolar w/ h2so4 cat. stirring on 50C for 4 hrs. >distill off toluene/benzaldehyde solution, let sit to RT >bisulfite adduct -> sodium benzaldehyde salt + toluene solution >clean salt >NaOH solution >sep. funnel >dry with KOH pellets (or dry CaCl2) >keep in amber glass bottle Is this sound?
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http://www.youtube.com/watch?v=wSF82AwSDiU Should I quit porn? no more /b/ or /soc/?
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"When will we ever use this in life?" Chances are, if you have gone to school, you've heard this question that seems to be thrown around every year in students, usually about math, right? I mean, the rest of the subjects seem to teach you something, for example: Science (without the math) = memorization and how the world works English = better understanding of English language and better comprehension of such things History = Cultural connections with the past and how things came to be, memorization but this last one is what most people have a problem with, leading to the age old question "when will we ever use this in life?" Math = problem solving and ability to basically think in a problematic way, allows you break things down, and to basically use your head. And yet, we still have all these people asking that question "when will we ever use this?". Fact of the matter if, you probably will never use quadratic equations in your lifetime, but what you will use are the problem solving skills that math teaches as a whole pretty much daily. It's not the content that math teaches you, it's the skill sets that math teaches you that you will use for the rest of your life.
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where my medbros at? ms2 here you guys getting ready for this yet?
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What's the point of negative numbers? Why can't we just set the smallest number as 0 so we don't have to deal with them?
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Has this ever happened to you? It's happening to me. I'm understanding more esoteric concepts, writing more proofs and such, but sometimes basic ass calculations are tedious to do. I haven't used a calculator in over two years and I'm helping my cousin with long division with ridiculous numbers(hundred thousands, millions, etc). This feels contradictory. How am I in graduate school for mathematics, yet pic related is how I feel sometimes. Word problems are fine and the logic's cool, but still. Just weird.
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/sci/ please humor me. There is a star 1 ly distant from an observer. Object travels from star at lightspeed toward observer. Does the observer see the object depart and arrive at the same time?
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i don't know whether the fucking method is slowly converging or not at all. fuck this shit. i've only slept 4 hours in the last 36 hours
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/sci/, give me a random number between -? and ? you can't

continental formation theory

6 more posts in this thread. [Missing image file: north and south plates jpg.jpg]
yo, we know the plates are moving this way. i know about gondwana, and pangea. so, there may be a cycle to the formation of the continents. check this out, some stuff i just saw on google maps that cannot be unseen. we know the plates in the pacific move towards the east, since hawaii formed the way it does, and we know australia will end up in the north, and india is moving north. i think asia and australia may be oldest, and that there may be new versions of the south american and north american plates forming in the ocean right now (similar shape and everything

Science teacher wants to not be shit

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Hello /sci/, I'm normally il/lit/erate, but I just got accepted in a science teaching role. Nothing fancy, just lower science general science. I'm here at ask, what would you have loved your science to have done? Is there anything that your teachers lacked that would have made you more interesting? Did they do anything that made you love science? Or anything that they did that just pissed you off? I'm going to be dealing with low ability kids, so really anything that helps them get into uni will make me happy.

phosphodiester bond

8 more posts in this thread. [Missing image file: 319px-Uridinmonophosphat_(...).png]
Ok, probably missing something completely obvious here (not a chem major...not even a STEM major) but can someone explain to me what's going on with the phosphodiester bond at 5'? I understand it's a condensation reaction, and the 5' OH is supposed to produce water, leaving the C-O-P bond, but for the life of me I can't see where the second H to produce H2O is coming from. Can anyone explain this to this liberal arts retard?
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ITT: Science ideas you were sure would work as a kid
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Since -2 is one of the "trivial zeros" of the Riemann zeta function, is the analytical continuation to that point equal to zero and hence informally "1+4+9+16+...=0" ?

Evolution Controversy

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Recently, I learned that Amazon has an evolution and science section, and their seems to be a lot of falsities floating around. Of course, other topics tend to be scant, and the only one that garners much controversy is evolution. Why? >inb4 the poster who tries to link to creationist websites to disprove evolution I'll just declare proof by assertion.
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Hey /sci/, I'm a second year undergrad in Electrical Engineering. Does anyone have any advice on how to into trans-humanism. Whether it's suggestions on where to intern or maybe advice that it isn't for EE but rather bmed and csc focused. Thanks!
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What if we could build miniature stars and use them for energy?
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does anyone know if skills that you work on while lucid dreaming actually transfer over to real life for example, if you were mediocre cook and practiced in your lucid dream, will that make you better?, also, if you're lucid dreaming do you actually rest?


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Can we talk about these things? Is there any kind of definitive evidence that microwaves can be detrimental to health? Does this method of heating destroy nutrients in food? Can the radiation that is exposed to the food cause cancer?
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Does the poison in ricin seeds survive drying and long-term storage?

FE/EIT and PE Exams

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Yo /sci/, never posted here before. I am registering to take the FE(used to be called EIT) exam for civil engineering in California. I have already graduated with my B.S. and feel confident about my ability with a lot of the material, even if I have to review it. However, I am wondering if any of you have taken this test. The more recently the better. If so, what books/preparation materials do you recommend? I got the standard prep materials from NCEES, but I want to know if there was anything that helped you prepare. Since I don't know how quickly this board moves, I'll bump a couple times and let it sit. Thanks for the help.

double-slit experiment strangeness

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http://www.youtube.com/watch?v=DfPeprQ7oGc hey guys, this is a thing i saw on TV awhile ago (not this video specifically, just some discovery show talking about this) and it's perplexed me ever since. someone posted it on /x/ just now but i wanted to get some responses from more scientific-minded people. what exactly is the consensus on this, regarding how the particles appear to act differently whether or not they are being observed?
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Has anyone here tried to read Dr. Daniel C. Dennett's groundbreaking new peer-reviewed neuroscience publication? http://www.naturalism.org/Dennett_reflections_on_Harris's_Free_Will.pdf What are your thoughts?
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>buzz does wanna go back to mars >buzz does wanna go back to mars >buzz does wanna go back to mars >buzz does wanna go back to mars slip of the tongue, or hidden secret NASA CIA black OPs agenda??? watch for yourself: http://youtu.be/CodM3pLuYC0?t=2m54s
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I know that this was shown by a taylor expansion but I didn't pay attention in maths last semester. If you could just give me a basic outline of the steps I need to take that would be great.
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a = 8, b = 4 a^{2} = 4b^{2} a = \pm \sqrt{ 4b^{2} } a = \pm 2b a = 8 & a = -8 How does this at all make sense?

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