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Archived threads in /sci/ - Science & Math - 16. page
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What does /sci/ think of this
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>>8522563
xKCD is cucked
>>
>>8522568

Mathematics is an attempt to understand and organize the world around us. This comes from an innate desire to learn as much about life as we can, I.E. applied philosophy.
>>
I think the "math is derived from philosophy" argument is flawed. Philosophy depends on logical and axiomatic foundations that are more in the domain of mathematicians than philosophers nowadays (though historically there's a lot of overlap).

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I thought I should make a new one.
>>
I guess I'll start.
How do I figure out substitutions and all that stuff while doing integration?
Everytime I see a new problem I can't for the life of me figure out what to do to solve it but then I see the solution and it makes sense.But there is no way I could predict the substitutions and all the tweaking stuff.
Tl;Dr I suck at integration and need to learn it ASAP.
Pls tell me how to.
>>
Best way to study math? How much repeating concepts until they stick properly?
>>
What is even the meaning of these in the Laplace notation? Let's that I have

y'= -2x+4y

With initial y(0)=1

y'+2x-4y=0
L{y'}+2L{x}-4L{y}=L{0}

I understand everything up to here, but then

[sY(s)-y(0)]+2X(s)-4Y(s)=0

What is it with the Y(s) X(s) things? I know how to Laplace simple stuff and the results are always s's, but where are these giant X and Y even coming from?

Why are there no large-scale, well-funded efforts to significantly remediate the biological ageing process through scientific and technological means?

There seem to only be a handful of small charities with a few researchers and annual budgets in the low single digit millions of dollars; and a few researchers at a smattering of universities.

It doesn't seem to be considered a very big deal; why is this, given that everyone in the world will suffer as a result of ageing and there seems to be no in-principle reason why we could not do an awful lot more to...
>>
>>8521115

R&D is always at the back end of concerns, it seems, even when that concern is ultimately foremost for the selfish (i.e. rational) organism.

Still, if we accept the OP's frame, then this is a deeply encouraging fact together with our capacity to destroy ourselves. You see, I've reached a misanthropic conclusion recently, which is that the species ought to simple cease to exist, rather than to allow these arbitrary life extensions to continue unabated, even to the point of a game-changing biological...
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>>8521148

Edgy.
>>
Why do you keep making this thread?

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These are facts:
Women are more fertile during the 15-25 year range.
Males feel more attracted to the 15-25 year range, independely of their age.
A 30 year old women has a 70% risk of being infertile.

How long until feminism is crushed by hard biology facts?
>>
>>8528230
>A 30 year old women has a 70% risk of being infertile.

lol?
>>
>>8528253
http://www.natureworldnews.com/articles/4462/20131016/delaying-pregnancy-cause-infertility-miscarriages-obstetricians.htm
>>
>>8528260

says nothing about 70% and My personal view,

"as someone who's been a consultant obstetrician for 20 years, is that people should try to start having their family by 37 because after that things become more complex and it's harder to get pregnant"

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>be me
>taking a calculus final
>kid sitting behind me is hacking and coughing and sneezing every few seconds, without covering his mouth
>this continues for the entire two hours

>be me two days later
>starting to feel a soreness in my throat

Fuuuuuuuckk meeeeeeeeeeeeeeeeeeee

Are there any 100% guaranteed ways to prevent a cold this early, while the symptoms are *just*...
>>
>>
If you're showing symptoms you've probably been infected for a while. So I'd say no.

Source: I got a 90% in intro to bio, so I basically have a complete working understanding of the human body.
>>
zicam cold remedy

It's like antibiotics for colds, it's amazing.

zicam + tylenol can get rid of body aches and that general "sick" feeling almost completely

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Couldn't dark matter just be cold neutrinos?
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>>8527862
With that mass? Also how the hell do you define temperature for a single particle?
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>>8527866
by its kinetic energy and/or momentum?
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>>8527873
I didnt mean that there is no way to do it, I was genuinely asking, is there a known way to achieve this?
Also, I think neutrinos have too low mass to explain dark matter and why would they have to be cold?

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Are you blind?
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>>8527854
I wasnt until i saw this thread
>>

>>

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What would happen if you traveled back in time and killed your grandfather? If he dies yuo dont even exist ever, so you cannot kill him.
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>>8527774
You can't travel back in time.
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>>8527774
Different timelines i guess
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>>8527778
t. time traveler shill

OP, would you like the red pill or the blue one?

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can anyone with an above average iq who has the money and is willing to work hard capable of getting a PhD?
>>
yes

really you only need two of them
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>>8527667
>above average iq
So, around 45% of the world is above average IQ, OP
>money
Well duh, how will you pay for the PhD?
>willing to work hard
You obviously do this and everyone does it as well but it depends on how fast you can learn is the actual difference
>>
>>8527762
what are you getting at?

what I was really asking in the OP i guess is how special do you have to be to earn a PhD?

Are the Feynman lectures on physics a good place to start for someone who has studies all the hs physics courses but wants to brush up his skills and maybel learn something new? Or are they outdated? And if so, what would you recommend?
>>
they deal with stuff that hasn't changed since they were written so it's OK. not outdated
i dont like the way it is structured tho
>>
>>8527631
>all the hs physics courses

"All"? So you took algebra based physics, then took honors algebra freshman physics, and then took AP premed watered down physics?
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>>8527655
You assume I live in USA, I don't. Your pre uni school system sucks, I know.

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So I failed Calc 1 last year in College because I was a piece of shit that didn't go to class and missed exams. I knew the actual material since I took Calc 1 in highschool, but now my college won't let me reapply for Calc 1 unless I retake the placement test. Does anyone have some good pre-calc/calc1 books for review?
>>
>>8527626
lol
patrickjmt.com has a fuck ton of video lectures for (self admitted) pieces of shit like you

beyond that, if you're dead set on conventional textbooks, go to bookzz.org and do a keyword search

Stewart's books are serviceable, assuming you need calc but aren't a math major
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>>8527626
Lang's Basic Mathemaics
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>>8527626

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I want to become programming literate enough to A) land a comfy job hacking at Blockchain/Machine learning meme tech and B) eventually hack together my own projects in the future as a hobby. What is the best way to go about achieving these goals? Would the education path (Community College then 4 year school) be the best way, or self learning and getting some sort of credential?

I don't care enough to learn everything there is to learn about computers... just enough to hack shit together and know when I need other people to pick up my slack.
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>>8527522
>comfy job hacking at Blockchain/Machine learning meme tech
lol
>>
>>8527541
I was just coming in to chuckle at this too, gr8 laffs OP
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>>8527522
If you think albegra/statistics is easy then go learn by yourself

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So I saw a thread like that this week and I think it was actually a good idea.

ITT: We share scientific facts. Can be related to any /sci/ area.

>>
OP is a faggot. (Source: >>8527516)
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>>8527527
Kek
>>
niggers are inferior
source: ayn rnd

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Could Heisenberg's Uncertainty Principle be resolved if we had better tools to measure electrons?
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>>8527495
But then we wouldn't have free will asshole
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>>8527495
Literature says no
I say yes
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>>8527495
I can't even imagine what "better tools" would be able to do that

There are quantum mechanical reasons for the inability to measure electrons, if I recall correctly the foremost explanation is that at a quantum level the electron reciprocates with its observer somehow, which changes its momentum or position.

The double slit experiment is really fascinating and illustrates this better than I can.

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Alright, fellows. I'm in a deep one. I need to find the turning points (points where $\dot{r} = 0$ ) of pic related.

The result should be given by the equation in pic, but the one I'm getting has minus at the second term in the second parenthesis.

Can anybody tell me where am I wrong?
>>
>>8527447
Also, to use the initial conditions (r0, v0) to express the constants arising from the integrals of motion.

>>
>>8527447
>has minus
I meant to say that it has plus in the second term of the second parenthesis.
>>
>>8527447
bampo

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Can someone explain to me how the sum of an infinite number of zeros can equal not zero.

I understand that we can do a lot of cool things by assuming that it doesn't sum to zero, but it seems apparent that the limit of pic related would be zero.
>>
it is zero.
it's the sequence:{0,0,0,0,0...} which converges to zero
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>>8527339
Why wouldn't it be zero? What is happening in this board? Is /B/ raiding us?
>>
>>8527348
>>8527371
Doesn't integration require the sum of an infinite number of zeros not to equal zero, though. If you imagine integration as a Riemann Sum as the area of the box approaches zero, then you're just summing a bunch of zeros together and getting a non-zero number.

Or, since I'm more familiar with statistics, we know that, given a continuous distribution, the probability of getting any one number in particular is 0%, but the probability of...

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I find it so strange that no one is talking about this, this might seriously be a beginning to a new era of mankind.
Can we connect logical thinking to our reward center? Would you do it?

>>
>>8527293
>"Science Finds God?"
>Spinoza
My Gott.*sniff*
>>
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post rare slavojs
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>>8527557
its dat boj o shit waddup

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Suppose that there exists infinite series that converges conditionally in classic space R of real numbers. Riemann series theorem states that I can rearrange elements of this series to get what ever real number I want.

If we look at R as algebraic structure, what is the main property that gives us this theorem?
What does group theory says about using operator infinite number of time?
>>
group structures don't allow for infinitely applied operators

it's a purely sequential property
>>
>>8526979
>If we look at R as algebraic structure, what is the main property that gives us this theorem?
The least upper bound property, and how any bounded closed set is compact. These properties form the basis for the proof that R is complete.
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>>8527439
but that's a topological property,
>>8526986

this anon is right

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Monty Hall is psychological bullshit

After your first decision, the host will ALWAYS open a goat door. There will ALWAYS be one goat and one car remaining. You have no impact on this outcome no matter which door you pick. It will always end with the same result. The first decision has zero relevance.

The first decision exists purely to act as a mind game to make you consider additional variables in your second decision which ultimately hold no meaning. Monty wants you to hold a sentimental value towards one door over another, to frame the decision as 'stay'...
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>>8526737
but each time you switch doors the average amount approaches 2/3rds of the time, this can be demonstrated experimentally. http://math.ucsd.edu/~crypto/cgi-bin/MontyKnows/
Surely if you deny the abstract theory, you at least support empirical evidence?
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>>8526743
>>
>>8526743
You're missing the point anon
That experiment is still with framing the decision as "stay" or "switch", which is dependent on whatever initial decision you made

But your initial decision is meaningless. The outcome is always identical (one goat door opened). It serves no purpose for setting up the second decision besides framing it to be about some arbitrary attachment

Run the exact same experiment as "pick door 1 or 2" rather than "stay or switch" which...

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I'm a scientist, specializing in criminology. AMA
>>
why do you make AMA here instead of reddit?
>>
Why can't I get a gf?
>>
>>8526635
Funny way to say psychologist

Anyway, i hope you get them pedos with the cooperation with the Gods of the Internet (NSA,FBI,CIA)
Also pls don't delet my chinesecartoons tho

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Lets say someone shot a giant space laser at the yellowstone caldera and burned a whole through the rock into the magma chamber, could it set off the volcano?
>>
That's a solid maybe.
>>
>>8526499
Why would it have to be a space laser?
Why not just dump a bunch of thermite down it?
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>>8526506
down what?

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Depression is not a mental disorder, it's a rational response to having a shit life
>>
So how do You convince your depressed mate that?
>>
>>8526413
Then it's not depression.
Depression is being chronically sad when you should not be. Being sad when your life is shit is not depression.

When you're successful, have a loving gf you bone every night, a nice house and car, and a good career and are so sad you can't get out of bed and want to blow your brains out, that's depression.
>>
>>8526418
But You are stating generic things. There can be other things in that Said persons Life. Things they want to be different, which they deem as depression, since they havent been true to Themselves about what they seek to change. For that Said person: he could be gay, only keeping that gf for his image to friends and family, while going to his job, to Pay for shit he Dont want. Like the House etc.

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"What" exactly are we?
>>
>>8526390
thoughts, according to Daykart
>>
>>8526390
Autistic
>>
>>8526390
woooooah #weed

i fucking love science

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Solve for x.
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>>8525844
ur a faggit
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>>8525844
>Solve for x.

Step 1: Type all that into wolfram
Step 2: hit enter

Works every time.
>>
>>8525844
try plugging in 1 or -1 first

Hey /sci/

I'm looking to start learning math from ground up up until college level.

Anyone has any books they recommend? Preferably in order, I don't mind sitting hours on end studying.

Thanks a bunch.
>>
literally khan
>>
>>8525390
So just hours of videos and interactive problems?

I'd prefer books and pdfs with clear explanations if that's possible because I don't have a Computer, but I do have quite a large pdf reader.
>>
>>8525384
Wanting to do the same as you OP. I have been using Pauls's online notes and would recommend using those to you, but as for books i have no idea so also interested in seeing responses to this.

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What is the difference between category theory, group theory, and set theory?

If they aren't fucking synonyms I'm going to beat up a math professor (I would have said shoot up a math class but I don't want the FBI breaking down my door. Now that I've said that let me say I plan to neither beat up a math professor nor shoot up a math class.) Because that shit is ridiculous.
>>
>>8525356
>cs major detected
>>
category theory studies objects and arrows between them

group theory studies symmetries

set theory studies sets
>>
They are completely different.

That being said your professor probably just wanted you to shut up and stop asking pedantic questions so he could teach the class and go home.

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mean?
>>
It means "I hate white people"
>>
>>8527598
more like....i hate European science..because....I hate white people
>>
>>8527587
relocating modern science to India

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>It seems like Elon is the only one attempting to leave Earth before 2020.

Will it take us another 200 years to send humans outside of our solar system?
>>
>>8527547
honesty it's pretty easy to send someone out of the solar system. The "problems" are.
Bringing them back.
Whats worth sending someone out there.
Why cant a sensor robot go
muh safety
In the early days of jets, rockets, and space flight the guys that were flying were daredevils who got pushed to the limit. No reason not to be on the moon right now.
>>
>>8527547
There's nothing worthwhile outside of earth you cockmuncher.
>>
WE

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Do photons exist inside an electron, well, or in any fermion, lepton, that can emit, absorb this package of energy?
>>
Photons are electrons
>>
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>>8527328
Yes; this is why electrons have lower energy levels as they get closer to the nucleus. Once the photons excape from the inside of the electrons, the electron loses mass, and therefrom momentum. Since it loses momentum, it also loses kinetic engergy, resulting in the n=1 energy level being the lowest. glad i could help
>>
>>8527341

oh wow, but about that loses mass, aren't photons massless, particles without mass, what do you mean by that when a photon leaves and electron, electron loses mass?

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If 2+3×4=14 then how come 2+3×4÷2=8? Shouldn't it be 7?
>>
this is the worst thread i have ever seen
>>
2+3x4÷2≠(2+3x4)÷2
>>
>>8527199
I just want to know. I was never very good at math.

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