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Archived threads in /sci/ - Science & Math - 258. page

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Where can I buy formalhyde, ammonia, and nitric acid? I need them.
8 posts and 1 images submitted.
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Meet me outside in 5
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If you took five seconds to not be a complete idiot and research this, you would not need to ask. Stop making a schmuck of yourself and read up on these chemicals.

Ammonia is extremely common in nature and can be distilled. Considering that you are a high school dropout, I recommend buying some cleaning ammonia in bulk.

Formaldehyde (which you spelled incorrectly) is used to preserve dead matter so you could possibly buy it from a science teaching supplier. Nitric acid can be synthesized. Look up the US Military Improvised Munitions handbook for more.

Do us all a favor and blow yourself up.
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>>9068993
You need White fuming nitric acid.

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I was doing random analysis stuff when I came up to
a ∈ (extended) R, a != 0 --> a^inf=0

Does anyone know what is this identity (if it's true) is called?
3 posts and 1 images submitted.
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[math]1 \,\in\, \overbar{\mathbf R}[/math], [math]1 \,\neq\, 0[/math] and [math]\lim_{n \,\to\, \infty} 1^n \,=\, 1[/math].
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>>9068972
But
a=1 goes to 1
a<=-1 has no limit
-1<a<1 goes to 0
a>1 goes to inf

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How do people finance their postgraduate studies? I'm trying to find information but finance major keeps coming up on google.
1 posts and 1 images submitted.
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What happens here?
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>>9068860
Surfing, BBQs, and terrible sunsets.
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>>9068860
Wind.
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>>9068860
>For the interior of Jupiter, let's imagine taking a descent from cloud-tops down to the core based on our best guesses of what lies below.
>You start falling through the high, white ammonia clouds starting at 0.5 atmospheres, where the Sun is still visible. It's very cold here, -150 C (-240 F). Your rate of descent is roughly 2.5x that of Earth, since gravity is much stronger on Jupiter.
>You emerge out the bottom of the cloud deck somewhere near 1 atmosphere. It's still somewhat bright, with sunlight filtering through the ammonia clouds much like an overcast day on Earth. Below, you see the second cloud-deck made of roiling brown ammonium hydrosulphide, starting about 2 atmospheres.
>As you fall through the bottom of this second cloud deck, it's now quite dark, but warming up as the pressure increases. Beneath you are white water clouds forming towering thunderstorms, with the darkness punctuated by bright flashes of lightning starting somewhere around 5 atmospheres. As you pass through this third and final cloud-deck it's now finally warmed up to room temperature, if only the pressure weren't starting to crush you.
>Emerging out the bottom, the pressure is now intense, and it's starting to get quite warm, and there's nothing but the dark abyss of ever-denser hydrogen gas beneath you. You fall through this abyss for a very, very long time.
>You eventually start to notice that the atmosphere has become thick enough that you can swim through it. It's not quite liquid, not quite gas, but a "supercritical fluid" that shares properties of each. Your body would naturally stop falling and settle out somewhere at this level, where your density and the atmosphere's density are equal. However, you've brought your "heavy boots" and continue your descent.

They have that big Krisna statue at the front, and there was that sacrificevideo from a while back. I'm not saying they're cultists or anything since it was obviously a prank, but why go through all the trouble? What did they have to gain? Why dress up, tie a guy, light fies, pretend to kill him and all that? To cause a few days of "bro, CERN is housing demons"?

What gives?

>inb4 /x/

Well yeah, no shit. I want an actual answer, not LARPers talking about Chthulhu.
10 posts and 1 images submitted.
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>>9068800
>why go through all the trouble? What did they have to gain? Why dress up, tie a guy, light fies, pretend to kill him and all that? To cause a few days of "bro, CERN is housing demons"?
Why not? Encouraging morons is a pretty popular source of comedy.
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Judging by the amount of debilitating autism and rebellious edge on /sci/, as well as the general state of politics in academics, I wouldn't put it past cernfags to do some retarded occult shit.
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>>9068812
Too much work for just a Live-Action shitpost.

>>9068826
Like what?

Can you explain the exact physical processes behind travelling back in time?

Also, can you explain the exact physical processes behind free will?
1 posts and 1 images submitted.
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is this a good book to start learn number theory?
or do you have any recommendations?

thank you
8 posts and 1 images submitted.
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>>9068600
bump. i'm taking numer theory next semester i should learn it soon
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>>9068600
I think actually reading the sticky might help:
>http://4chan-science.wikia.com/wiki/Math_Textbook_Recommendations
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>>9068600
https://www.maa.org/press/maa-reviews/a-friendly-introduction-to-number-theory
https://www.maa.org/press/maa-reviews/a-friendly-introduction-to-number-theory-0

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Hello /sci/,

I just discovered the following rather interesting result:

[math]\sum\limits_{n=2}^\infty \zeta(n) - 1 = 1[/math]

Perhaps it has already been published somewhere but I came across it myself. Anyone know of any possible uses for it?
9 posts and 2 images submitted.
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Thanks a lot looser you just got cucked
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>>9068608
What? Why? Am I wrong?

Numerical verification to the first few terms:

http://www.wolframalpha.com/input/?i=Sum%5BZeta%5Bx%5D-1,%7Bx,2,10%7D%5D

Also I don't see what the big deal is, the RH is concerned with 0<Re(x)<1, right?
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neato

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I took Algebra 2 over the summer before heading into my first year of college and, if I do a good job on the final I'll get a B minus. I'm very worried about this since I wanted to get a STEM degree.

In my mind, it was: College --> Graduate --> Career. I guess that's not too crazy, but I feel really stupid now for not having had the foresight to even consider what I'd do if not for college. I don't even want to admit to what I had been planning; it's now seriously humiliating in light of my current predicament.

I have no idea what I'm going to do now. All I do know is that I can't join the military.
9 posts and 2 images submitted.
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>>9068577
>Algebra 2

Why didn't you do precalculus?
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>can't join the military
Are you trans lmao
No but seriously , what do you want to do ?
College is not for everybody, where are your strength and weaknesses ?
There are other major beside STEM despite what this cesspools pretentious high schoolers claim.
Don't fall for the meme
>>
do you have a passion OP? do whatever feels right for you

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Anyone here think retrocausality is a far better explanation than instantaneous action at a distance?
5 posts and 1 images submitted.
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>>9068554
The issue is moot. Entanglement acts locally. Measurement outcomes are matched by superposed observers as they exchange information: *both A an B subsist as
superpositions of observers that saw heads or tails. It is only when they
exchange information that they agree, i.e that the states of observer A and
B collapse respectively with respect to observer B and observer A into states
where the coin measurement has yielded the same outcome."
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>>9068554
I think the effort to "shush out" retrocausality is disingenuous to science, and is an unconscious effort on behalf of human egocentrism.

The number cases where retrocausality matches the explanations without any conflict are significant. With an especially notable case of the delayed choice quantum eraser.
To those who are jumping at the chance to say that I'm a brainlet as this place loves to do, let me preempt you by appealing to your (no-doubt) need for consistency and aesthetic patterns;
If the universe can described as consistently lazy, that is- it has a tendency to achieve the lowest energy state- then how disruptive would it really be if the universe kept up its lazy appearance by defining the "cause" only when it had to for the "effect", at least on a very tiny scale, and thereby keeping to the lowest energy state required- such as may be the case in delayed choice quantum eraser.
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All particles are ultimately composed of photons. The only reason we perceive time is because of the phenomenon of mass. Photons don't experience time, nor does "distance" exist for them. It follows, then, that the universe can be modeled from the "perspective" of the photon as a single point, with the cohabiting photons in that point undergoing all interactions with each other instantaneously, which we would see as the past, present, and future of the universe.

Thus, the universe is a static object that occupies neither time nor space, just not from our point of view.

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Theoretically, if one were high from use of marijuana, how could one induce a stronger high? Could any type of activity or ingestion of something do this?
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Mango has been a proven potentiator. Look it up.
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>>9068560
I'm going to get mangoed as fuck tonight
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>>9068539
Edibles are allegedly more powerful than when cannabis is smoked for reasons I do not recall.
Tolerance breaks are another method of experiencing a stronger high.

18th century -- classical mechanics -- ordinary differential equations.
19th century -- continuum mechanics -- partial differential equations.
20th century --- turbulence, plasticity--- ???
2 posts and 1 images submitted.
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>>9068513
Integral equation
>https://en.wikipedia.org/wiki/Integral_equation

[math]\varphi (x)=f(x)+\lambda \int _{a}^{x}K(x,t)\,\varphi (t)\,dt[/math]

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The Sun is directly overhead and your watch says that it's June 21. What's your approximate latitude? How do you know?
2 posts and 1 images submitted.
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>>9068451
Very basic question. Do your own homework.

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Please share some good math and physics books.
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>>9068421

Fourier Series by Tolstov

Introduction to Tensor Calculus, Relativity, and Cosmology, by Lawden

Analysis I, by Tao

Tensor Analysis, by Grinfeld
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>>9068421
http://4chan-science.wikia.com/wiki//sci/_Wiki
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>>9068421
principles of mathematical analysis - rudin
real and complex analysis - rudin
linear algebra - shilov
ordinary differential equations - arnold

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Howdy, folks.

I'm here to ask for some clarification on my admittedly layman understanding of some spacey, sciencey goodness.

So, that trope about aliens out there somewhere, watching Gilligan's Island, because of the delay in our broadcast transmissions; I've had an idea for a story that sort of hinges on this sort of idea, but:

1) Even if an alien civilisation could pick up our broadcasts, wouldn't they need a compatible system to interpret them? Does this change if the signal is plain, analog audio without any video signal?

2) I managed enough research to put together that over galactic distances, we shouldn't have to worry much about things like relativistic effects affecting the signal, however:

3) That's basically moot, because our signals become so attenuated after a comparatively short distance, that the odds of anyone picking them up to begin with are tiny.

4) Say that we get past that though, does anyone have an idea what the odds are that a society could intercept this sort of signal and not recognize that it was a centuries old broadcast?

(Getting purely into the fiction in my head, I had imagined a culture with some sort of sci fi, instant communications, FTL etc, so maybe they've lost the notion that this signal had been in space for a couple hundred years before they caught it).

I know this is maybe a bit off topic, but I hope it falls far enough away from homework and/or advice that I could be forgiven.

Any help is hugely appreciated. Thanks in advance!
4 posts and 1 images submitted.
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but how else are we gonna waste so much time and money on useless shit?
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One hopeful daytime bump, and then I'll let the thread die.
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There's a plot in an episode of Futurama incredibly similar to this, if it helps anon! I think the episode was titled Single White Lawyer, or something of that sort.

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