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/sci/ Science & Math

Threads added between 2014/01/26 16:00 and 2014/01/26 22:00

29 more posts in this thread. [Missing image file: android.jpg]
what are your hopes and dreams, /sci/? for the world, mankind, yourself, anything. pic related is mine. creating a more durable, longer lasting version of our species seems like such an obvious solution to so many of the problems we face today.
41 more posts in this thread. [Missing image file: Psychology.jpg]
Psychology is a science, right? General Psychology thread.
12 more posts in this thread. [Missing image file: calculus_7.gif]
Why wasn't Calculus discovered much sooner? Take for example the rate of change along a parabola: \frac{f(x)-f(x_{0})}{x-x_{0}} = \frac{x^2-x_{0}^2}{x-x_{0}} = x + x_0 So setting x = x_0 gives you the known result. Obviously this is biased enough but seems like rather simple stuff for the great minds to figure out?

Non-computable real numbers

25 more posts in this thread. [Missing image file: turing.jpg]
I thought it would be nice to start a thread to introduce a genuinely interesting mathematical concept that some of you may not have heard of. Among the real numbers are the rational numbers. These include all integers 0,1,-1,2,-2,\ldots and all fractions \frac{1}{2},\frac{7}{11},\frac{-19}{3},\ldots. The rational numbers have finite or recurring decimal representations. They are easy to understand. Outside the rational numbers are the algebraic numbers. These are numbers that are the solution to some polynomial equation. They include all surds \sqrt{2},\sqrt[3]{7},\sqrt[5]{\sqrt{7}+\sqrt{14}} and so on. These have infinite, non-recurring decimal representations, but are still quite easy to understand. Outside of these, lie transcendental, but computable numbers. These are mysterious numbers, like \pi and e. They are so baffling that we still don't know whether or not simple expressions like \pi+e^\pi are really transcendental. But at least all of these numbers are computable. For \pi, we can easily write a program P that for any number n returns the n^{th} digit of \pi. Same for e. We can approximate these numbers arbitrarily well. But outside of all of these, lie the non-computable numbers. These are numbers whose decimal representations cannot be predicted by ANY computer program. They are numbers that cannot be described or explained in a finite number of words or symbols. There are no familiar non-computable numbers, but they are everywhere. Almost all real numbers are non-computable, and indescribable, and essentially incomprehensible without an infinite amount of time. So, next time you all find yourselves thinking about \mathbb{R}, remember how strange this set really is! P. S. This is not a troll thread. Check out Wikipedia http://en.wikipedia.org/wiki/Non-computable_numbers
9 more posts in this thread. [Missing image file: 1325089559734.gif]
What are the neural correlates of consciousness, by which I mean sensory awareness? Note that I'm not asking about the hard problem of consciousness, but only about which neural processes have been associated the emergence of awareness. Also, general neuroscience thread.
3 more posts in this thread. [Missing image file: humans in charge of being(...).jpg]
How can science justify its materialist bias? Pro tip: It can't.

Need ancient space beleifs.

13 more posts in this thread. [Missing image file: 1344580844389.jpg]
Doing a project for school. Have to gather information about cultural space myths. Trying to find lesser know cultures to do so as to be more surprising to the teacher. Our group is already looking into Egyptians, Aztecs, Chinese, and Indian space myths and beliefs. Im here to ask for suggestions on a fifth culture to find information for. All help is greatly appreciated.
14 more posts in this thread. [Missing image file: ngCQYwLQdrU.jpg]
This one goes to the few actual /sci/entists lurking here. EndNote vs. Mendeley vs. RefWorks vs. Zotero vs. other Which one, and why?

Correlation?

4 more posts in this thread. [Missing image file: 1390607032199.jpg]
>Chronic kidney disease globally resulted in 735,000 deaths in 2010 up from 400,000 deaths in 1990. -http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(12)61728-0/fulltext

Spectator: Intelligence is genetic

37 more posts in this thread. [Missing image file: image.jpg]
Intelligence is genetic, when we will start seriously discussing this and how we can change schooling to better help our children? http://www.spectator.co.uk/features/8970941/sorry-but-intelligence-really-is-in-the-genes/
4 more posts in this thread. [Missing image file: 1389980485480.png]
Is there a continuous extension of Fibonacci numbers? Like the gamma function is defined on all complex numbers and generalizes the factorial, is there a function on all of R (or C) yielding the Fibonacci numbers when being fed the naturals as its argument? If it exists, does it have applications in physics or other sciences?
3 more posts in this thread. [Missing image file: Welcome+to+the+League+of+(...).jpg]
How would the discovery of the graviton affect Einsteins general relativity? Does it drop the general relativity as being wrong about gravity or is there space for the graviton in general relativity?
3 more posts in this thread. [Missing image file: 1389820970566.jpg]
how do venis flytraps work
10 more posts in this thread. [Missing image file: images.jpg]
Hey, can I get confirmation on something. So we all know about the speed of light, can't go faster than it...blah blah. But let me place a scenario for you: A light year, is the distance it takes light (a photon) to travel in one year. I read a book, that states that if we were in a spaceship and travelled close to the speed of light we could go further in one year then a photon would. This is because space will bend (constrict) (it would constrict to an observer) more as we travel faster and faster to the point where in one year a photon would of only travelled a light year (duh!) but us travelling at/near the speed of light would actually reach the andromeda galaxy (which is 2.5 million light years away). in a year travelling a light speed due to the space bending properties of light speed. Is this correct? I've heard many physicists like Neil tyson say this is wrong. pic related.
0 more posts in this thread. [Missing image file: prob 4.jpg]
ok I just took a practice exam I waas able to get v'(t) = (1-n)*p*v+(1-n)*q But the rest of the questiosns stump me. Any help?
2 more posts in this thread. [Missing image file: CodeCogsEqn.gif]
What are the intervals of monotonicity of
0 more posts in this thread. [Missing image file: asdf.jpg]
How willing is /sci/ to help me out? I have these Further Physics Questions, which our school sets us for those aspiring to do engineering at University, and I was struggling a bit. Particularly with (b) and (c) for the graph, and (b) for the monochromatic light. For (c) I understand you have to find the GPE, but how do I get a value for h? I don't want direct answers, more if you could guide me in the right direction. Thanks in advance.
7 more posts in this thread. [Missing image file: 325px-Linear_subspaces_wi(...).png]
why does \frac{ln(a)}{ln(b)} = ln_b(a)
4 more posts in this thread. [Missing image file: Godel-Escher-Bach-edriver(...).jpg]
Did you learned something, /sci/?
2 more posts in this thread. [Missing image file: images (1).jpg]
In a Complement system number theory gurus have known for hundreds of years, apparently, that one decimal # can be subtracted from another by adding the diff of the subtrahend from all 9's and adding back a carry. (What?) It's called: Diminished radix complement of the subtrahend. >Can someone explain this to me in a digestable way?? Why is casting out 9's simplified arithemtic?
13 more posts in this thread. [Missing image file: Jerry-Seinfeld-Newman.jpg]
Where did the universe come from?
4 more posts in this thread. [Missing image file: Untitled.png]
In spherical polar coordinates (?, ?, ?) ?=azimuthal ?=polar How is this a sphere with radius 3?? ? = 6*sin(?)*sin(?) True or False multiple choice hw q, I already missed it, just wondering why its actually 3... I personally did: (?, ?, ?) sin(?)=y/(?*sin(?)) by definition of polar coords.. and then I cancelled the sin(?) out in the main equation to get ?^2=6y ? And then tested that eqn out with x=sqroot(3)=y=z and it didn't work... Help a noob?
2 more posts in this thread. [Missing image file: 12345678.jpg]
Assuming concepts such as negative energy are possible, and were practical for humans to use, how could a perpetual motion generator be constructed?
4 more posts in this thread. [Missing image file: dak_18_schematic.jpg]
Any electronicfags here? I'm supposed to be designing a Linear PSU found around the house. Is there any straight forward ones which aren't too simple to do some breakdown analysis on? Any help appreciated






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