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Archived threads in /sci/ - Science & Math - 35. page
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>real analysis 3 oral exam tomorrow
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>real analysis
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>>7810444
why is that alien holding a crowbar ?
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>>7810453
that is a golf club.

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I came across the EMdrive recently. It appears to be pseudoscience. It cannot work without violating conservation of momentum.

But then I found it was independently verified by three teams. How is this possible?
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>note that those 3 teams arent billionaires right now rigorously using this technology to advance jack crap

the results are so small, people are waving their hands off as merely normal interference
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>>7810433
SPR is actually trying to market it as an alternative to ion drive for satellites
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>>7810429
"There are other examples of observation conflicting with the 'laws of nature', such as galaxies rotating at speeds different from that predicted by the 'laws of nature'. In this case, rather than modifying the 'laws' to conform to the new observations, the theorists simply revised the universe to confirm to the laws by 'deducing' existence of dark matter and dark energy from the fact that the galaxy rotation would be 'violating a law of nature' unless the universe...

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Is it possible for magic to be real?
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Only if wizards are using magic to make us muggled believe that the idea or magic is completely retarded and impossible
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>>7810386
meme magic is real
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>>7810386
No, then it wouldn't be magic, which it isn't

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So I'm on book ten in Euclid's Elements.

On a third apotome, would the rectangles contained by the rational line set out and the annex/whole really be medial, considering the rational lines are not commensurable in square?
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So basically this question is rather esoteric, considering it IS a very unused, error-ridden portion of the Elements, however I'm simply wondering if it is REQUIRED for non-square medial areas to have sides commensurable in square only.

Where can I find physics formulas? I'm not studying at an uni, but I'd like to solve things concerning CMB but I don't know where to find them.
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just go on wikipedia, type cmb, read the first equation and you're pretty much done. go to MIT and pick up your physics PhD
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>>7810375
>I want to solve things concerning CMB
>Where can I find physics formulas?
lmao
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>he thinks the problems of physics can be solved just by doing algebra on the equations we have

I got into a conversation with a friend of a friend recently who told me that he took the equations of general relativity and particle physics, set them to zero and tried equating them but he couldn't make the math work out. I had to not call him fucking retarded and I think I deserve compensation.

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Hey anons, I'm doing linear algebra and reducing matrices takes me way too fucking long. I need some tips to do it faster. BTW no calculators
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>>7810343
practice more
there's no magic to doing them faster in general any more than there is magic to adding general numbers fast. You're just uncomfortable with the machinery.

also
>reducing matrices by hand
>ever
nice lin alg for engineers course
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>>7810343
>doing them by hand
m8 if you reduce more than like 10 matrices in your entire life you're doing it wrong.

It's ok to do it a bunch of times to understand the technique but then either use matlab/numpy or write your own program.
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>>7810343
Easy. Skip immediately to the proof-based problems.

I'd like to get your opinion on what we are going to perfect in 3D printing in 20 years.

Vote here :
http://strawpoll.me/6639852

Concrete Houses / Shelters
Medicine / pills
Food
Functioning Organs (hearts, kidneys, eyes)
Prosthetic limbs / bones / skulls
Robotic equipment / Drones
Ground vehicles / Small air vehicles
Weapons (rifles, side arms)
Nanomachines / Biochips
Autonomous Robots (Atlas, Asimov, T800)

http://strawpoll.me/6639852
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>>7810337
I want sexbots. I'll take one Emma Watson and one Emma Stone.
>>
3d printed organs (skins, like Mine craft skin, look how you want)
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>>7810414
Good morning sir. Which position do you want me to be in today ?

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Why is the observable universe a sphere with us at the center?

In theory wouldn't that mean light(photons) is coming towards us from all directions? Pic related
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>>7810333
Because we can see (roughly) the same distance in every direction
so it defines a sphere centered at where we observe from (here)

and yes, that does mean light's coming at us from every direction, but that's nothing particularly dazzling

if you look around you in space there's always going to be stars on all sides of you unless you were at the very edge of the universe for some reason
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>>7810336
Now what about the microwave radiation background wouldn't that make it look closer to a come due to the fact that we are looking at a single point of origin for said radiation?
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>>7810340
The CMB is observed in all directions. Maps you see of it are usually full sky.

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oh no...
solve it
>>
this again???
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As a great man once said, "if the blue meanies are going to get me they'd better get off their asses and do something".
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Just what i was looking for. Im not even going to pretend like i can solve this, but your knowledge would be great. Am i assuming correctly in thenfact that each symbol hasban assigned letter?

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Not sure where to ask, /sci/inteists, but is there any way to harness energy from a change in altitude?

E.g. if a helicopter goes up to an altitude of 2000 feet and then down again and repeats, is there any way to harness some sort of energy, by placing some sort of contraption in it?
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>>7810323
easy, just put a system of ropes and pulleys on it that drives a generator.
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>>7810323
Yeah but you would have to harness more energy than you are consuming to generate said energy.
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>>7810323

Go up, you're putting energy in.

Descend, you are releasing the energy you put in.

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Can anyone help me in this.
There's some kind of trick that I can't seem to find.
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>what is trigonometry
http://www.wolframalpha.com/input/?i=sin%28x%29*cos%28y%29

Back2School with you
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>>7810298
That isn't the problem. Computing 10-point dft is time consuming. There's somekind of trick in here
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DFT is a linear function, so I would write
$\displaystyle \cos \left ( \frac{3 \pi }{5}n \right ) \sin \left ( \frac{4 \pi }{5}n \right )= \frac{1}{2} \left ( \sin \left ( \frac{ \pi }{5}n \right )+ \sin \left ( \frac{7 \pi }{5}n \right ) \right )$
and sum the 10-point DFT for the two sine functions.

So what happened to this faggot? Why is there no news from him?
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>>7810285
Just another retard who spent every day of his childhood learning maths at a ridiculous fast rate to please his parents and now that he made it to academia he is just another cog. Another small name in the lists that from time to time comes up with another published paper that will change nothing and no one will read. All for what? He could be have enjoyed his youth a bit more and then become what he is now but it is too late to think about that now. He has to publish another useless paper that literally no one will...
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He's probably done more triple integrals than Newton did at his age. Don't you think he's done enough for science already?
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>>7810297
>co-authoring 1 insignificant paper

Niga are you serious?

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Is this why you guys study STEM? To get a gf?

>work hard to get rich in Silicon Valley
>Buy a former pornstar single mother
>She dies while cheating on you
>raise her kids!

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>>7810280
>used goods
>EVER

No, he was a white knight cuck like pic related. He could have been from lib arts or business, as it usually is.

Never pick up a woman who was a slut, because she will forever be a slut. You may fuck her one or more times. You can use her for all I care. Actually, even have her as your gf if that will secure easy sex.

BUT NEVER EVER EVER AND I MEAN EVER MARRY AN EX-SLUT.
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>>7810280
>>7810299
>marriage
>2016
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>>7810312
I would get married if the rules of engagement didn't give all the power to the woman. It's better to get rich and fuck bitchez like fuckdolls until you die.

Hi, can someone here help me with some python?

I am trying to generate a list of random length (but between 3-15; in following example), containing random integers (between 1-10 in following example).

At first I tried using the random.sample function:
>a=random.sample(range(1,10) , random.randrange(3,15))
But then learnt that it picks unique elements from the given population - hence the length of my first argument must be greater than the value of my second argument.

What other methods are there that I can generate a...
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>>7810261
[random.randint(1,10) for i in xrange(random.randint(3,15))]
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>>7810261
You could try numpy
def ran_list():
return np.random.randint(3,16,random.randint(1,10))
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>>7810263
thank you. that fixed it for me.

i slightly modified it and am now using:
>testlist=[random.randrange(0,100) for i in range(random.randrange(2,20))]

(ignore the different number ranges i selected).

thanks, bye!

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How did something as complex as inflammatory response develop evolutionarily?

I believe it should be the central idea in the creationist "argument for complexity" rather than the eye, which is straightforward sensory.
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>>7810242
You'd only say that because you don't understand the idea of irreducible complexity.
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>>7810242
Organism develops mutation that provides basic remediation in cases of cellular trauma --> organism survives and passes on gene with high success. Over a long of time frame, more genetic alterations are selected for in favor of an immune system -- both adaptive and innate.
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>>7810289

so you're saying the evolutionary need for a penis happened to evolve at the exact same time as the vagina? gender is the ultimate counter argument to evolution.

checkmate atheists

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