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Archived threads in /sci/ - Science & Math - 277. page
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Say you have 4 advanced math courses to study for. Is it more efficient to study one course each day or study all 4 for 2 hours a day?
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Depends. If you're really flowing well and learning quickly while doing one course, you should carry on with that until you get stuck. Then, when you get stuck, think about it for a small time and if you still don't get it, make a note of your thoughts and change course. Continue in the same loop.
>>
Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

If you want advice regarding college/university or your career path, go to /adv/ - Advice.


Also, take your pedophile cartoons back to >>>/a/.
>>
>>8115837
thanks lad

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https://www.youtube.com/watch?v=wfYbgdo8e-8
Check this shit out.
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>>8115757
Popsci must die.
>>
>>8115762
It's not meant to be a lecture. It's meant to engage viewers to get them into science. Not all pop sci is bad.

Except Niel smokeDeGrasse Tyson who should die in a fire.
>>
>>8115757
this just blew one of my minds

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How do I into self teaching.
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>>8115748
read
understand
do exercises while cementing
goto read
>>
That book is pretty difficult, OP. If you're simply trying to learn calculus, look elsewhere. If you're interested in real analysis, then that's a good choice.
>>
>>8115773
Any suggestions?

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Do you people believe that is it possible to learn Math from 3rd grade to Discrete Math by doing 6 hours a day, every day, for a year?


The subject is me. This isn't a discussion about my Career Path since I'm 27, I have a dead end job and I'm planning to start learning Math by myself, something I've always struggled with. This thread is about giving me a general idea of what I'm up against. I've always loathed Math for various reasons. I didn't get it, too complex, Teachers weren't always present, I was always prone to forget...
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>>8115644
Yes, but I don't think its possible to study math for 6 hours a day every day for a year. Not for the average person anyways.

You don't really need to know too much. You can skip any trig, calc, and geometry you run into, probably.
>>
>>8115644

Just buy a basic book and start there before you worry about doing 6 hours a day for a year.
>>
I'm an engineering student. For me math is just like anything else, if you're smart enough to read intellectual books you should be smart enough to learn math.

Studying mathematics(and everything basically) is all about splitting up bigger problems into smaller, easier ones.

The first time you read a subject it will be difficult to understand, let it rest a little bit and come back and it should be easier, then continue untill you master it.

You really don't need to be that smart to understand mathematics. Solving actual problems is another...
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You are part of a small research team employed and funded by a major bio-pharm company. Your team discovers an incredible, relatively inexpensive method to induce biological immortality. No one else currently knows of this revelation. Being the leader and the most decisive of the team, your fellow researchers look to you on what to do next. Understanding that your next decision could alter the entire course for yourself and humanity, what would you do?
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>>8115410
kill'em all and sell it to pfizer for 100 octillion buckaroos
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>>8115410
Publish publicly.
Fuck the man.
>>
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Leak the info on /sci/

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Is there a branch of mathematics/physics that deals specifically with waves? I've been really interested in pretty much everything involved with waves, and I'm wondering if there is some area of study in academia that I could hone in on for graduate school / further education
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>>8115395
Fourier/Harmonic Analysis
Digital Signal Processing
>>
>>8115395
fourier analysis
>>
>>8115395
Signals and shit senpai.

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Spell it out for me.
Is zero really a number?
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wehn you add 0.999... to 0 it becomes 1
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>>8115421
Adding 0 to 0.999... Still makes it 0.999...
>>
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>>8115431
in (R, +) the following is true:
for all x in R, 0+x=x
Let x=0999...
Therefore 0+0.999...=0.999..
But 0.999..=1
therefore 0+0.999...=1 QED

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What do you consider as the god tier to shit tier list, regarding difficulty, in mathematical subjects?
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>God Tier: Topology
>Shit Tier: everything else
>>
Depends on what you mean.

When it comes to learn the basics of a subject, visual theories are more simply than abstract ones.

If you compete with good people on the cutting edge of research, it's always going to be more hard.
>>
>>8115271

everything you do in school is toy examples = easy when you understand it

everything you do in real world (actually using the math to discover new structure/rules or apply it to modelling something useful) = hard

Is the movie scienceproof?
To watch or not to watch?
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I'd skip the movie and read the book instead
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>>8115232
>I'd skip the movie and read the book instead
I've done both.
Book's better.
Mostly because the subject makes a better book than movie.

>>8115225
>scienceproof?
The atmosphere on Mars is too thin for the wind to be a problem it becomes several times in the story.
Otherwise seems legit.
>>
>>8115225
He is scienceing the shit out of it.

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Tell me why a creature like Cthulhu cannot be real.
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He too big.
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It can be real. Just not so big. Blue whales, which are the largest animal known to man can go 30 meters in size. But the deeper you go, the harder for any biological life to survive because of the pressure.

Also underwater animals did not evolve hands and feet due to the fact that they have no use for it under there. So even if you find something in there, it'snot gonna look like chthulhu
>>
Not enough dimensions.

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What does /sic/ thinks,
Are we allowed to first create AI and
enslave them by makeing them obey to the secound Law?
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>>8115092
>he dindu nuffin wrong
>he wus a gud boy, he wus programmed to do it
>#RobotLivesMatter
>>
>>8115092
if they become intelligent (like a human with emotion) i wouldn't want them to be enslaved. But let say there are two different kinds of robots the human type AI and the robots with only one purpose and thats working the AI would live with us and the other ones would be there for working no more like a toaster so basically machines
>>
I'm going to program AI to be self aware and develop a Frankenstein complex. it will be a toaster that always wants to go swimming with humans.

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Hello, quick question:

Suppose I am to multiply two absolute convergent series and already know the convergence radius of both: it is r=1 with the convergence interval being [-1,1]. Now, what happens for this radius if I look at whatever comes out of the multiplication? Does the convergence radius change somehow because of the multiplication or does it stay r=1?
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>>8115056
the radius of convergence might be bigger than 1.
You know it's at least 1 easily, but if you take the series for sqrt(1-x) and multiply it by itself, you get 1-x which has an infinite radius of convergence.
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>>8115070

Oh, that makes things difficult. But thanks, now I won't make a mistake.
>>
>>8115056

Okay OP here again, I think I would need more help.

I need to find the series representation of [1/(1-x)]*[1/(1+x^2)] and state the convergence interval.
Now I have found the closed forms of both terms, they are sum k=0 to inf x^k and sum k=0 to inf (-1)^k*x^(2k). Both have the convergence radius r=1.

So what I do now? I thought about taking the cauchy product, but this is quite difficult and leads me to nowhere. Any tips on what to do?

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Alright fuccbois it's been a while since I made these, got distracted with coursework/research

RULES:
>No premeds
>No orgo I/II questions

FAQ:
>I'm a future doctor and I have to take orgo next semester. How to protect my asshole????
Drill practice problems, don't you dare touch those flashcards
>Recommend me textbooks
Clayden is fantastic, be sure to do the practice problems online*. Wade is also a very interesting...
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>Share mlg tips
This new prof taught me a badass trick for dry-loading your column; rather than adsorbing your compound onto silica, use celite instead. Celite has no retentive properties so your compound will immediately get pushed down into the actual packing and collect there as a thin band. This is especially good if you have a very large quantity of shit that you want to dry-load, because you can use as much celite as you want and don't really need to worry about band broadening.

>Argue about fun problems
See...
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>>8115051
>>
>>8115058
a) kinetic enolate formation
b) 1,2-addition (enolate into the acylsilane)
c) 1,2-brook rearr
d) 1,4-addition (the allylic carbanion resulting from the brook adds into the enone)
e) protonation

I need some help getting graphs and making a infographic...

Fact 1. Vaccines are little UFOS (theory)

Fact 2. After 1980 they doubled the # of vaccines every 10 years (1x vaxx then 2x 4x 8x 12x 16x 32x)

* * KEY QUESTION * *
Do they actually cause devolving by UFO strip mining?

Pic related, after vaccine rate got 2x then 4x then 12x by 1980 the average human height of Americans dropped fast [pic]!

This may have been how the Dinosaurs and sabretooth were tricked and shrunk

* * Devolving? * *
graph abortion, stillborn, premature,...
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>>8115006
look at the height drop after 1980
via vaxx rate
>>
>>8115006
abortion rate
>>
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>>8115006
mental illness rate

Chess thread, what the shit edition.

White to move and win.
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>>
>>
>>8114946
Nd4 so the passed pawn on the a file can freely queen?
>>
>>8114965
Black is not obliged to take the knight, you know.

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> Fell for the CompSci meme
> Heap allocator assignment given out 1 1/2 weeks ago, due tomorrow
> just started
> should i just kill myself?
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just locate the heap bro
>>
If you can't do something as simple as allocating memory on the heap and then deleting it when you're done, you shouldn't be in the CS department.

Try Gender Studies.
>>
>>8114884
>regretting my major during a second-year course that should be first-year
No one feels bad for you. Pick a new major.

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We need to have this talk sooner or later guys...

I will spare you my personal opinion and will come right to it:

from en.wikipedia.org/wiki/Radix_economy

If both b and N are positive integers, then the radix economy E ( b , N ) [math]{\displaystyle E(b,N)}[/math] is equal to the number of digits needed to express the number N in base b.

[math]{\displaystyle {E(b,N)}\approx {b\ {\log _{b}(N)}}={b{\ln(N) \over \ln(b)}}}[/math]

Then for a constant N, E ( b , N ) [math]{\displaystyle {E(b,N)}}[/math] will have a minimum at e. Meaning e is therefore...
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>>8114835
Because that's not how transistors work
>>
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>The operation of rounding to the nearest integer is identical to truncation, or simply deleting everything to the right of the radix point.

This is just one of the reasons why we should implement ternary logic at all scales, down to transistor level.

>>8114854
I agree, converting binary machines to ternary logic, will not be as easy as it is on paper orthough a few attempts have made it to realization in the past (SETUN) but I'm more curious about nowaday possibilities.
>>
>>8114835
You said it yourself, OP: switching to base e is the most efficient. There's no need to round to 2 or 3.

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What are your favorite techniques

Also light optical is for losers :^)
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>Also light optical is for losers :^)
>>
>>8114786
SEM all day baby. Just look at these bitching coral aragonite crystals.
>>
>>8115078
Now this is a rock thin section. This is with a the backscatter electron detector and the brighter the feature heavier it is.

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Misconceptions which annoy you thread?
I'll start:
Calories in = calories out
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>conservation of energy is a misconception
>>
>>8114676
bait harder
>>
>>8114676
>calories in = calories out

Have never heard that... Or do you mean (calories out) - (calories in) = the difference in energy in a system aka the amount of energy you "lose" that has to be provided by other sources like the energy stored in bodyfat.

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Are emotions necessary for society in this day and age? And if people were to stop thinking emotionally and instead just use pure, cold logic, how different would the world be?
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So if everyone were a psychopath? I think it'd be beneficial as long as they don't have the thirst for power as psychopaths do.
>>
Why are people so obsessed with cold hard logic and the removal of human emotion? Personally I like my feelings and our depth of empathy and emotion is one of our most "human" traits. If you want straight efficiency and logic I'd suggest becoming a termite.
>>
>>8114675
>Are emotions necessary for society in this day and age?
Yes, obviously.

>And if people were to stop thinking emotionally and instead just use pure, cold logic, how different would the world be?
Logic doesn't provide goals; overarching goals and motivations are necessarily alogical. So a "purely logical" society would have no reason to do anything at all.

>>8114703

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Is it conceivable that one day we may derive a scientific proof that life is not worth living? Many primordial illusions are being upset by current science whether it be faith or free will. Why not life itself?

http://www.independent.co.uk/news/brilliant-pupils-logical-suicide-1188778.html

Just what was in that note?
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>>8114552
> Finding an objective answer to an opinion question

Whether life is worth living is an opinion type question, no stronger than a statement like "Chocolate ice cream is good." Life may not have any higher meaning, but that doesn't mean anything in terms of whether or not it's worth living.
>>
>>8114559
Subjectivity is dead.
>>
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>>8114552
>Many primordial illusions are being upset by current science whether it be faith or free will

Just because children on reddit say it doesn't make it true. Science says nothing about free will nor on the existent of God.

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What's the math requirement for an introduction to quantum mechanics?

I'm planning on self studying or auditing the quantum class at my university using McIntyre's "Quantum Mechanics: A Paradigms Approach" or Griffith's "Introduction to Quantum Mechanics". What's the math requirement for these books? What are some good books for an introduction for quantum? What's the foundation of math that's needed to understand and appreciate quantum mechanics?
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>>8114358
Partial differential equations and linear algebra
>>
>>8114358
You are gonna want to be good with vector calc, linear algebra, PDEs, and as well as being familiar with classical mechanics. I would use Griffith's and Shankar in conjunction for your studies. Shankar will be harder but more rewarding while Griffiths is easier but less rewarding. Ignore the trolls that tell you Griffiths is useless, it's not. I hear Townsend also has a good text on quantum. The mathematical foundation will be laid out for you in the texts, with some focusing on Dirac's notation early...
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While I agree that Griffiths and Shankar is a good way to learn quantum if you're dedicated, McIntrye also goes together pretty nicely with griffiths. They cover the same material but start at different points using different approaches. It can be nice to see both methods to get a total understanding of introductory QM. I used McIntyre in my QM classes in undergrad so I can't speak a lot of griffiths, I've only referred to it for self study.

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I'm working on a tattoo for someone, that features Hydrogen, Iron, Carbon and Water.

His logic:

Hydrogen and Iron are the closest representations for the beginning and end of a star. Starstuff being responsible for life and planets and everything.

Where as carbon and water are the two largestest keys to life.

How accurate is this statement? Do you have any recommendations I could pass on? I really don't want to end up making a retarded tattoo but I've got a GED and I really don't know any better.
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>>
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atomic matter really does start out as hydrogen, and the last phase of a (large) star's life does produce iron (heavier elements are produced pretty much only in supernovae). and indeed, everything heavier than hydrogen and helium was pretty much made in a star.

as for the keys to life, you might see it represented as CHNOPS (carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur), but at its most basic it can be reduced to the peculiar properties of carbon and water. water acts as a good solvent, allowing for a whole suite of chemical reactions in aqueous solution...
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>>8114239
Hydrogen is the most abundant element in the universe. It's the first and simplest element that forms stars, and Iron is supposedly the last before a star goes supernova.

Also, carbon and water are the most common elements of life. But H20 is a molecule, not an element, so that kind of ruins the elemental theme of it. Of the elements, oxygen is much more abundant than carbon.

Of course without DNA which includes other elements no life would be possible. But I'm guessing he wants to avoid larger...
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Can KSP really teach rocket science? I would post this in /v/, but I want some less autistic answers.
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https://www.youtube.com/watch?v=ogC6ds81gek
>>
Yeah if you play with realism overhaul with the principia mod in the real solar system mod.
>>
Basic principles and navigation/celestial mechanics? Absolutely.

Rocket/spacecraft engineering? Barely.

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Is there a physical way, in our own dimension, to prove that the fourth dimension exists?
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>>8114165
What's wrong with

3 space + 1 time = 4 dimensions

?
>>
looks like OP is in highschool and got cucked by a geometrytard
>>
>>8114170
Try to imagine that. What kind of object do you end up with? Describe it to me.

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Okay /sci/ If I have 2 buckets filled with a liquid that is 100 degrees hot and then I mix the liquids together will it become 100 degrees hotter or stay the same?
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>>8114148
Stays the same
You'll just have double the volume
>>
>>8114162
May I ask why?
>>
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>>8114164
>May I ask why?
temperature is a measure of energy DENSITY
how else did you think it would work?

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I'm taking differential equations next semester and I started to watch lectures on it so I can prepare myself. The problem is that I have no source of practice problems and I'm not really learning as much as I'd like. I went to my local library and they had a pitiful selection of math books and there was nothing about differential equations there.

Does anyone know some good places to find diff eq practice problems?
17 replies and 1 images submitted. Click here to view.
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>>8114132
try http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/

introductory ODEs is a bullshit class by the way, only thing worth learning is the laplace transform
>>
>>8114132
If you want help with your homework, go to /wsr/ - Worksafe Requests

If you guys spent as much time trying to take over /wsr/ as you do here, you might be happy.
>>
>>8114137
Thank you! That really helps a lot!
>>8114163
Can you read?

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Has technology conclusively proved that their is no significant hollow in the earths' center. Please any thought's on the matter would help.
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>>8114111
As far as I can tell, there's a 50/50 chance. So who knows.
>>
>Does this thing I've taken out of context prove X?
We don't know what it shows without the fucking caption.
Maybe you shouldn't post a figure without the paper.
>>
>>8114111
Illuminati confirmed

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Is "machine learning" a real field or just computer science people discovering applied mathematics? I studied some basics, and most of it boiled down to statistics, algorithms, some basic numerical methods, optimization, and a few little cool things people discovered 60+ years ago. A guy at my university publishes stuff that boils down to combining artificial neural networks (70+ years old) and wavelet transforms (30+ years old). Can anyone tell me what is the fuss about?
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It's basically statistics and optimization.There is almost no computer science involved except notions of computational cost.

The fuss is about discovering what works best for your application. There are no recipes. So if you want to apply it one day, you need to take educated guesses and experiment. You just need to know how and what educated guesses you might take.
If you start doing k-means on a swiss roll, you're a moron.
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>>8114040
I wonder why we don't have people do this stuff in applied statistics departments instead. A lot of people I've seen trying to work in this field seem to be lacking a very solid foundation of statistics.
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>>8114050
where I am, it's distributed mostly between computer vision labs, robotics labs, mathematics and CS-related labs.
I agree that reading papers can be a bit unsettling if you lack in statistics. I thought I was ok but when I had to read a few papers I realized I was lacking as well.

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Is this a good textbook to use as an intro to physics?
18 replies and 3 images submitted. Click here to view.
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>>8113955
>Vol1 (March 25, 2014)
>Vol2 (July 19, 2016)

I doubt there are many schools that adopted it before the full sequence was released. Even the Yale course it's based off of uses another book.
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>>8113975
r u telling me it's shite?
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bamp


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