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Archived threads in /sci/ - Science & Math - 1. page
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So let's say you have to find limits using only algebraic manipulation. No effective methods like applying epsilon delta or using l'Hopital are allowed.
How do you know whether the limit you arrived at using algebraic manipulation is correct? One can get different results via different algebraic manipulations. How do you know that it's time to plug in the limit and just calculate?
16 replies and 1 images submitted. Click here to view.
>>
The only was I see a purely algebraic way of finding a limit would work if it ends with

limt_{h -> 0} const. = const.

as in the limit h to 0 of

$\frac {(x+h)^2-x^2} {x+h} = \frac {x^2 + 2xh +h^2 -x^2} {x+h} = 2x \frac {x+h} {x+h} =2x$

In that case the solution will be unique, yes.
>>
>>7858022
Could we perhaps work with preimages and open sets?
>>
Dumb weeaboo

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I found this in the solutions part of my textbook. Why does this even work? There's no explanation at all.
How is bringing up the derivative of cos here even relevant to finding this limit?
19 replies and 1 images submitted. Click here to view.
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>>7857855
They recognized the limit as the derivative of cos(x) at x = 0. Pretty funny desu.
>>
>>7857855
because the limit is exactly, term by term, the derivative of cos at 0. that's nice
>>
>>7857872
But why would they write this shit like that? That's like writing that the limit equals 5^(0)-1. Illogical, and makes no sense at all, even though it's technically correct.

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Is there an easy way to square this equation?
(ax^2+bx+c)? I always have to write it out and do it manually, is there a specific formula or something?
13 replies and 3 images submitted. Click here to view.
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>>7857713
why dont you compute it with a, b, c and see what comes out?
>>
>>7857717
With what? If it's the GC, i'm retarded with it, I do most of my shit with pen and paper, i use GC for Systems of Linear Equation and Basically observing graphs.
>>
[eqn](ax^2+bx+c)^2 = a^2 x^4+2 a b x^3+2 a c x^2+b^2 x^2+2 b c x+c^2[/eqn]

Hey /sci/, can you guys come up with an algebraic expression that ends up equaling out to xy=qt3.14? Valentine's day is tomorrow and I think that'd be nice for the inside of a card. X & Y will be replaced with initials.
11 replies and 2 images submitted. Click here to view.
>>
>>7857680
Sure anon!

1 = 3.14qt / xy

Hope this helps!
>>
>>7857680
>>7857680
q(t) = cv(t)
the equation for the charge of the capacitor
if c= 1/(3.14)

q(t)*3.14 = v(t)
replace v(t) with X Y
she'll suck your dick straight away anon
>>
>xy=qt3.14
>xy
>XY
is he good looking?

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There are some exercises in my calculus books that are limits of x approaching 0, with x < 0 being written under them.
How does one solve this kind of limits? Or at least, what terms should I be looking for on Google?
17 replies and 4 images submitted. Click here to view.
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>>7857615
You have to be 18 to visit this imageboard.
>>
remember to sage
>>
>>7857621
I'm 21. What's your point? I dropped out of high school, and want to get my diploma this year by studying alone.
Dipshit.

Anyway. what's the difference between left-hand limits, and x < 0 being written right under the x approaches 0 part of the limit?

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Let's say I have an undestructable jar.
1. What would be the outcome if you put all atoms into the jar
2. What would happen if you "forcibly combine" them by let's say raising/lowering the temperature/pressure/...
15 replies and 1 images submitted. Click here to view.
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>>7857512
they would just cancel each other
>>
this question belongs to the askscience thread
>>
>>7857512
They would create a 0 degree sun

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How ?
I tried TCD et TITT.
14 replies and 2 images submitted. Click here to view.
>>
Manque pas des intÃ©grales quelque part ?
>>
>>7857302
Gamma et I manque les integrales de 0 Ã  +infini
>>
>>7857292
>>7857302
>>7857304
fucking speak english

http://gizmodo.com/chinese-fusion-test-creates-90-million-f-for-102-secon-1757993374
WE'RE GETTING CLOSER
11 replies and 3 images submitted. Click here to view.
>>
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>>7856914
I CAN FEEL IT
WHERE IS THE SPACEX EQUIVALENT FOR FUSION
>>
>>7856920
HOW DO WE GET ENERGY FROM THE HEAT WHEN THERE IS NO MATERIAL KNOWN TO MAN THAT WILL NOT MELT FROM IT
>>
>>7856920
C M E T A H A
M
E
T
A
H
A

So what does /sci/ believe happens from the observer's perspective when it dies?

There are no correct or incorrect answers. What do you personally believe happens? Let's have a good old fashioned speculation thread.
21 replies and 4 images submitted. Click here to view.
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>>7856879
>There are no correct or incorrect answers.
Bullshit. The correct answer is you die. Anything else is just made up nonsense.
>>
>>7856879

OP's thread does not deserve propagation, because he was clearly just visiting the old meme-website ytmnd.com and lazily came up with the idea for this thread with same ideas and source material without mentioning the old website.

The below is something that OP was probably just looking at, and was a noted "xD random meme!" about ten years ago, involving cats and metaphysics. In fact, the web page was created well before the youtube "keyboard cat" meme took off, which OP's filename...
Comment too long. Click here to view the full text.
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>>7856891
Blah, damn my kind terminology. Replace 'correct' and 'incorrect' with 'right' and 'wrong' if it helps oneself understand that this is for speculation.

>>7856903
>this dense, making an assumption and posting their own link. Nice try Mr. Viruspants

I'm still up if anyone wants to add value to the thread. But, it's looking quite lame... Thank goodness I still have myself to talk to.

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Why does Methylated spirits cost more than white vinegar if it's also made out of ethanol but with one less chemical reaction?
14 replies and 1 images submitted. Click here to view.
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>>7856575
because things cost is based on what you can get away charging for them, not what they cost to produce.

vinegars food, nobody is going to spend a lot on basic food ingredient.

methylated spirits is a chemically sounding high tech liquid probably used by science or some shit. Its gonna be pricey
>>
Product prices are dependent on how much the consumer believes its worth. The only people who don't believe that is the consumer.
>>
>>7856594
>>7856609
If you buy acetic acid in bulk it will be as cheap as methylated spirits, so it's more of an economy of scale issue however you are right in that plebs should wise up and buy concentrated acetic acid and water it down to what they need because it's the same fucking thing but 1000x cheaper than store vinegar.

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What do they put into the water that makes it blue?
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>>
hydronium hydroxide
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>>7856473
Could you say that in non-nerd terms please?
>>
>>7856476
oxidane

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do people get degrees because muh jobs or because they're passionate about the field? and if it's the latter, are they better off in that field finding jobs than those who are just reeking desperation about making money and so forth?

i hear people telling me science and medicine are dead fields and that i should get a degree in walmaranomics becuase it's a more viable area and i'll get a job at any retail outlet i want.
28 replies and 2 images submitted. Click here to view.
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>>7856437
Because they get a job. Most kids in school are in a degree because "I was always good at _____", "it pays good", "mom said so" or "idk, lol".

You are bred to perform on tests, to recite, memorize and repeat. You're not harbored into a learning environment to enjoy what you do. Most kids, and a majority of high performing kids do these specific tasks well. It is no true metric of their intelligence or skill, just a dick measuring tool parents use to convince themselves...
Comment too long. Click here to view the full text.
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>>7856437
It's funny because you are bitter.

I can bet you anything that you don't even have a degree yet. Probably still an edgy freshman.
>>
>>7856567
honestly why even get a degree? you're basically fucked.

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Scientists have discovered how to delete memories.

http://www.telegraph.co.uk/news/science/12152337/Scientists-have-discovered-how-to-delete-unwanted-memories.html
11 replies and 5 images submitted. Click here to view.
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>>7856277
Knowledge is never a bad thing just how we use it sometimes is.

Science doesn't go to far people do
>>
I actually want to be able to digitally save my memories, in video or images
>>
>who is currently working on a technique to erase painful memories

fuck off with click-bait

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Just give this series a chance and you will be amazed of what you will learn. I know I was!

And this is a link to the first video:

http://thespiritscience.net/2014/02/26/spirit-science-1-thoughts/
11 replies and 1 images submitted. Click here to view.
>>
>>7856163
f someone knows it, please tell me what you think
>>
REEEEEEEEEEEEEEEE
>>
>>7856163

he's like 20% facts, 50% probable truths and the rest is just made up bullshit or ridiculous analogies

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Is the water in our bodies actual H2O? Would it be possible to somehow extract this water using a powerful enough purifying system for example?
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>>7856032
Yes.
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>>7856032
Sure, hotbox a human and collect the water through condensation.
>>
spice must flow

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