File: 1488727111111.jpg (49KB, 850x400px) Image search:
[Google]
49KB, 850x400px
Where can I read more about generalized Fourier Analysis?
I know about Fourier series on Hilbert Spaces, Fourier Transforms, and all that jazz for [math] L^2(\mathbb{R})[/math] functions, but I'd like to know how it works for more general spaces. I'm specifically interested in Fourier Analysis on the [math]d[/math]-dimensional torus [math]\mathbb{T}^d[/math].
8 Posts / 2 Images
View this topic
>>
File: IMG_0350.jpg (112KB, 720x960px) Image search:
[Google]
112KB, 720x960px
Tolstov my man. Read him in high school and he's stayed with me ever since. Plus it's a dover text so it's cheap
>>
>>9067661
This deals with Fourier analysis on the (discrete) torus as well?
>>
>>9067647
An Introduction to Abstract Harmonic Analysis Loomis
File: 1498907649877.jpg (117KB, 800x988px) Image search:
[Google]
117KB, 800x988px
Can there be noncommutative vector space? Vecor space with addition forms abelian group, can there exist similar object which forms nonabelian group under addition? If so, how are these object called, are they being studied, where can I find something about them
5 Posts / 3 Images
View this topic
>>
>>9067646
You can look at modules over noncommutative rings, where scalar multiplication would be noncommutative.
>>
>>9067659
I'm not asking about modules but about structure similar to vector space over a field where vector addition is not commutative
>>
>>9067646
https://en.wikipedia.org/wiki/Group_with_operators
Anonymous
Wim Hof breathing exercises 2017-07-27 07:55:00 Post No.9067634
[Report] Image search: [Google]
Wim Hof breathing exercises 2017-07-27 07:55:00 Post No.9067634
[Report] Image search: [Google]
File: questioneverything.jpg (80KB, 520x750px) Image search:
[Google]
80KB, 520x750px
Wim Hof breathing exercises
Anonymous
2017-07-27 07:55:00
Post No. 9067634
[Report]
[View this topic]
Hey, I am trying to get the gist about Wim hof breathing methods (YouTube it quickly if you are unfamiliar), and if it's a bunch of bogus hippy bullshit (because it has most of the warning signs of that afaic) or if there is any substance to it.
The Wikipedia page ( https://en.wikipedia.org/wiki/Wim_Hof ) states there is a study about it/him, publish is a respected scientific journal (PNAS). However, suspiciously, the reference doesn't actually link to it.
What do you guys think?
*skeptics unite!*
4 Posts / 3 Images
View this topic
>>
Could be good. I've somehow learned myself some Tibetan tummo technique or some shit to gain more body heat without being aware of it at first. so I don't see how this won't work.
>>
File: 400px-Shallow_water_blackout_diagram_1_revised.svg.png (16KB, 400x273px) Image search:
[Google]
16KB, 400x273px
>>9067634
You may black out dude, pic related.
Also, I've only looked into this for about 2 minutes, and already I've found some guy claiming that you'll "totally oxygenate your blood" etc.. If you follow the link marked "shallow water blackout" on the wikipedia page you linked, you'll see that that's not true. Your blood is normally 98-99% oxygenated without any need for tricks.
Not looking good so far...
>>
File: 400px-Shallow_water_blackout_diagram_2_revised.svg.png (19KB, 400x273px) Image search:
[Google]
19KB, 400x273px
>>9067634
>>9069283
Second part/ what happens when you hyperventilate, then hold your breath. First pic is normal breathing.
Anonymous
Hello waifu my old friend 2017-07-27 07:14:26 Post No.9067550
[Report] Image search: [Google]
Hello waifu my old friend 2017-07-27 07:14:26 Post No.9067550
[Report] Image search: [Google]
File: Principia_Mathematica_54-43.png (43KB, 800x333px) Image search:
[Google]
43KB, 800x333px
Do you ever study and come across a difficult problem, and you get a bit anxious just by looking at it. You look up, scratch, cough and when you almost get back to work, you suddenly remember how hot that waifu from the anime you watched last night is, and you start daydreaming. 15 minutes go by and you realize "fuck, i have work to do, fuck it" another 10 minutes go by and you decide to go out for fresh air.
You have that urge inside of you i have to get back to work, but you don't really feel like it. After you come back inside you go and play games. At the end of the day before bed you are just like, what has my life become.
3 Posts / 1 Images
View this topic
>>
That's all life is ever going to be, a struggle.
It gets a whole hell of a lot worse when you give up and stop struggling.
>>
>>9067550
I do feel like that about some problems but I just skip them. There is no shame in skipping problems.
I mean, life is too short. If I already started a "hard" problem then I will usually go until the end but if the problem is so weird I don't even know how to even start then I have no time for that. I just google the solution and learn so that hopefully the next time I encounter a problem of that brand I will be able to get into it.
Anonymous
How large does my cranium have to be to woo Ashkenazi women? 2017-07-27 05:51:31 Post No.9067381
[Report] Image search: [Google]
How large does my cranium have to be to woo Ashkenazi women? 2017-07-27 05:51:31 Post No.9067381
[Report] Image search: [Google]
File: 1500878424969.png (204KB, 1423x1320px) Image search:
[Google]
204KB, 1423x1320px
How large does my cranium have to be to woo Ashkenazi women?
Anonymous
2017-07-27 05:51:31
Post No. 9067381
[Report]
[View this topic]
I've always been told I have a large skull and I often can't fit hats on my head.
2 Posts / 2 Images
View this topic
>>
File: 19424914_1553933141323805_2677689264677847040_n.jpg (107KB, 1080x1350px) Image search:
[Google]
107KB, 1080x1350px
I would also like to know this.
File: FB_IMG_1500536784888.jpg (37KB, 736x496px) Image search:
[Google]
37KB, 736x496px
Okay /sci/ I have some second order differential equations from some dynamical systems, and I want to draw the phase portrait.
Anybody know some software which will draw me the phase space?
4 Posts / 1 Images
View this topic
>>
>>9067379
Just plot the system as a quiver in matlab
>>
>>9067387
*free software package
>>
>>9067409
Just plot the system as a quiver in python.
File: 41MQNQ9eE5L._SY355_.jpg (14KB, 355x355px) Image search:
[Google]
14KB, 355x355px
Why doesn't /sci/ have the same respect for chemists as it does for methmaticians and psychics?
10 Posts / 2 Images
View this topic
>>
>>9067374
>I can't spell simple everyday words!
>Why don't you respect me ;_;
>>
>>9067377
I'm pretty sure he did that on purpose, autist
>>
cause the chemists have jobs to attend and cant spend all day shitposting on 4chan
File: 1499317752686.jpg (29KB, 491x368px) Image search:
[Google]
29KB, 491x368px
Is it possible for me to go back and chase my dreams of working for NASA when I'm 23 and have a community college CS degree?
3 Posts / 1 Images
View this topic
>>
If you're willing to no life study
then yes
>>
>>9067348
Sure, they need cleaning service.
File: [00] VA [2006] Industrial Legacy Vol. 1.jpg (87KB, 649x649px) Image search:
[Google]
![[00] VA [2006] Industrial Legacy Vol. 1.jpg](https://i.imgur.com/UQUkGlt.jpg "[00] VA [2006] Industrial Legacy Vol. 1")
87KB, 649x649px
I want to study law and I want to study mathematical modelling. Don't ask me why. What can I do with the combo?
8 Posts / 1 Images
View this topic
>>
create lawyer AI
https://www.youtube.com/watch?v=ZF0J_Q0AK0E
http://www.rossintelligence.com/
>>
>>9067276
No. Something exciting.
>>
>>9067270
Forensic probability and statistics maybe? I don't know OP, this combination is retarded.
Or you could go into finance.
File: 1438542534363.png (594KB, 785x820px) Image search:
[Google]
594KB, 785x820px
I need some advice. I have spent the past year living abroad in the UK, where I studied my undergrad (Aerospace Engineering) trying to find a job but I wasn't able to. After failing at so I'm planning the next step.
Should I go back and keep trying, go somewhere else (mb Germany - where i don't know anyone tho) or stay at home with a very small prospect of getting a job and study a master's? I'm lost
4 Posts / 2 Images
View this topic
>>
>>9067211
This is probably the wrong board. So I would usually tell you to fuck off. But I am in the same situation ( I'm not doing aerospace tho). I'll try getting a part time in the 2nd year. The show must go on.
>>
File: 1495289892850.jpg (82KB, 700x525px) Image search:
[Google]
82KB, 700x525px
>He didn't go for avionics instead kek
good luck finding a job cuck
>>
>>9067211
Its a wicked problem.Take a risk. Go somewhere new. You'll learn more through the experience.
Anonymous
Polymath vs Specialist 2017-07-27 03:57:17 Post No.9067168
[Report] Image search: [Google]
Polymath vs Specialist 2017-07-27 03:57:17 Post No.9067168
[Report] Image search: [Google]
File: im-vs-dd-440.jpg (88KB, 440x275px) Image search:
[Google]
88KB, 440x275px
Is it better to be the former, or the latter? Can you even be a polymath in this day and age, where the amount of information is humongous? Hell, factor in things like musical or philosophical/historical education,athleticism and the list goes on and on. Can a man, in this day and age, be a Renesance Man?
Pic kinda related (Stark is a specialist, Doom is a polymath). Couldn't be arsed to find something more fitting.
2 Posts / 1 Images
View this topic
>>
>>9067168
Stop reading this shit you dumdum.
File: fold_geometry.jpg (51KB, 1130x455px) Image search:
[Google]
51KB, 1130x455px
Why are folds so complex?
3 Posts / 1 Images
View this topic
>>
>>9067059
stop that shit
anything can be as complicated as you want.
For example. you can say that something is white or you can say that it has the same color of a dark body at 6500ºK.
And remmeber, there are hundreds of textbooks based on triangles. Just three lines connected by three vertices. Hundreds of books.
>>
>>9067243
What the fuck is wring with such people?
File: 1500411903329.jpg (1MB, 3035x3024px) Image search:
[Google]
1MB, 3035x3024px
Hey /sci/ I was wondering how the science works when it comes to calories versus the actual weight of food. For example, 3,500 calories roughly comprises one pound. Does this mean that 3,500 calories worth of food will always weigh one pound prior to being eaten? Or is there some conversion process in the body which makes up the difference?
tl;dr: is it possible to have food that contains 3,500 cals but weighs less than a pound?
10 Posts / 2 Images
View this topic
>>
>>9066964
Yes. And no.
>>
3,500 calories is 1 pound of body fat. Most food isn't made of pure body fat.
>tl;dr: is it possible to have food that contains 3,500 cals but weighs less than a pound?
Yeah, a little less than 2 McDonalds Shamrock shakes.
>>
>>9066964
fat = (9cal / g) * (453g / lb) = 4077cal / lb
But the body is not 100% efficient
Accurate calorie measures are derived from measuring the caloric content of a food prior to digestion then measuring the caloric content of the doodoo after digestion.
File: IMG_1245_1.jpg (217KB, 1152x864px) Image search:
[Google]
217KB, 1152x864px
Hello /sci/ Do we have any geologists in the house?? Anyone know what this is? I know its volcanic and most likely from japan.
8 Posts / 2 Images
View this topic
>>
It's a rock
>>
File: 66ce4975a145fad7bab310cdb5b09cd9e2ae2f6d4cbbe9a23fcd9efec75fd376.jpg (15KB, 282x179px) Image search:
[Google]
15KB, 282x179px
>>9066938
>>
I can confirm that while it is a rock, it is not meth. So we can rule that out.
Im pretty sure at least
Anonymous
What role does herd instinct play in mainstream science? 2017-07-27 11:55:19 Post No.9066844
[Report] Image search: [Google]
What role does herd instinct play in mainstream science? 2017-07-27 11:55:19 Post No.9066844
[Report] Image search: [Google]
What role does herd instinct play in mainstream science?
Anonymous
2017-07-27 11:55:19
Post No. 9066844
[Report]
[View this topic]
They say that extraordinary claims require extraordinary evidence. Go figure what that means.
What actually happens is that purported evidence rejecting non-mainstream claims gets no scrutiny at all. See here for an egregious example: http://weirdtech.com/sci/expe.html
Does mainstream science play with loaded dice?
6 Posts / 1 Images
View this topic
>>
Read some Kuhn.
>>
>>9066844
yes, but think about it this way... most of the current accepted theories were at some point marginal and non-mainstream and some of them if not alot of them probably got some degree of skepticism or ridicule, but they worked their way into the mainstream through their merit eventually.
>>
>>9066844
>What role does herd instinct play in mainstream science?
less of an impact than it does on theists