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/sci/ - Science & Math

 Name Options Subject Comment Verification 4chan Pass users can bypass this verification. [Learn More] [Login] File Please read the Rules and FAQ before posting.Additional supported file types are: PDFUse TeX with $tags for inline and [eqn] tags for block equations.Right-click equations to view the source.  08/21/20 New boards added: /vrpg/, /vmg/, /vst/ and /vm/ 05/04/17 New trial board added: /bant/ - International/Random 10/04/16 New board for 4chan Pass users: /vip/ - Very Important Posts [Hide] [Show All] ### Janitor applications are now closed. Thank you to everyone who applied! [Catalog] [Archive] File: nseqs.gif (17 KB, 710x532) 17 KB GIF Why are partial differential equations so difficult to find exact solutions to? It's just partial derivatives, right? 1 reply omitted. Click here to view. >> >>14876868 PDEs introduce a nonlinear term which doesn't play well in the system. We have a great understanding of how to solve differential equations which only involve: [math]\frac{dx}{dy}, \frac{d^2x}{d^2y},...$

PDEs involve extra terms such as:
$\frac{d^nx}{d^ny}(x)$

The x term makes the system nonlinear. You can also have other non constant quantities which change in the equation but aren't a derivative, or multiple derivatives multiplied together with different variables. There are a nearly infinite number of possible equations and they all are difficult to solve unless you can separate variables, in which case you can just reduce the system down to two ODEs multiplied together, essentially.
>>
>>14877027
stop smoking drugs
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>>14876868
it's not difficult to estimate partial derivatives, it's difficult to find a function whose partial derivatives satisfy an equation
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>>14876868
Systems of coupled PDEs are very hard to solve, I only know how to solve ones analytically if we assume separability. Beyond that I think you have to use approximate methods like the energy method and what not
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>>14876868
>It's just partial derivatives, right?
Ah the mind of the infinitive.

Just partial derivatives...
Let me know when you've reached the billionth derivative of position with respect to time. We should be able to find at least one solution

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why do (YOU) study math and science?
> inb4 money and riches
if self fulfillment and desire to understand reality are not mentioned I consider you NPC cattle
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>>14872527
Beause this is the path I chose for myself at 16 and I'm to far in to quit now.
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>>14875136
This is a dangerous level of stupid.
Intelligent enough to form reason.
But too disorganized to make any use of it.
You should go into politics.
>>
>>14875814
Retarded? His post made good sense you fucking pea brain.
>>
>>14872538
It's true there's nothing to learn but tricking the mind into bullshit.Things, just are.
>>
Money and it's fun

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Why does he hate limits so much?
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>>14875968
Cause his dick is less than epsilon in length
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>>14875978
>precision
Ah yes, really need to know one trillion digits of pi or else you can't build anything useful.
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>>14875968
Better teach kids they have limitless potential.
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>>14875968
>Just do the thing an infinite number of times
How?
>OMG DO YOU EVEN STUDY MATH, IT'S IN THE FUCKING TEXTBOOK OF COURSE IT'S TRUE LMAO
>>
While the wild burger does have valid criticisms of the concept of limit, his disingenuous backhanded comments that don't explain shit nor raise any actual issue makes it inevitable that we end up with retards like this >>14877892 who don't understand what they're criticising.

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"Every 18 months, the minimum IQ necessary to destroy the world drops by one point."
When will your neighborhood sociopath be capable of creating airborne AIDS that kills everyone in 3 weeks?
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>>14877761
I think ultimately the world will end

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I am a retard.
How do I get smarter?
Yeah, but what?
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>>14877285
>be mute and cant write
>IQ plumments to -inf
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>>14876642
First you have to get up early in the morning and get to work. Only after that you can do the following things in no particular order:
- Tell the truth.
- Do not do things that you hate.
- Act so that you can tell the truth about how you act.
- Pursue what is meaningful, not what is expedient.
- If you have to choose, be the one who does things, instead of the one who is seen to do things.
Pay attention.
- Assume that the person you are listening to might know something you need to know. Listen to them hard enough so that they will share it with you.
- Plan and work diligently to maintain the romance in your relationships.
- Be careful who you share good news with.
- Be careful who you share bad news with.
- Make at least one thing better every single place you go.
- Imagine who you could be, and then aim single-mindedly at that.
- Do not allow yourself to become arrogant or resentful.
- Try to make one room in your house as beautiful as possible.
- Compare yourself to who you were yesterday, not to who someone else is today.
- Work as hard as you possibly can on at least one thing and see what happens.
- If old memories still make you cry, write them down carefully and completely.
- Maintain your connections with people.

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>>14877709
- Do not let your children do anything that makes you dislike them.
- Do not transform your wife into a maid.
- Do not hide unwanted things in the fog.
- Notice that opportunity lurks where responsibility has been abdicated.
- Read something written by someone great.
- Pet a cat when you encounter one on the street.
- Do not bother children when they are skateboarding.
- Don't let bullies get away with it.
- Write a letter to the government if you see something that needs fixing - and propose a solution.
- Remember that what you do not yet know is more important than what you already know.
- Be grateful in spite of your suffering.
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>>14877709
Or just find what you can enjoy. If not. Death be bliss.
>>
Understand that society's perceived notion of intelligence only measures how good of a slave you are and disengage from it to pursue your own interests.

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P as opposed to N*P is supposed to indicate what in terms of communication? How does one define a polynomial as a stand-alone process versus a collaborative one?

Are collaborative polynomials not a thing?

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>MACRONUTRIENTS
>Consensus recommendations
>Evidence suggests that there is not an ideal percentage of calories from carbohydrate, protein, and fat for all people with or at risk for diabetes; therefore, macronutrient distribution should be based on individualized assessment of current eating patterns, preferences, and metabolic goals.

How are people supposed to prevent and cure diabetes with guidance like this coming out of our medical institutions? It's such bullshit. We know high fat high protein low carbohydrate is the best way to combat diabetes and they just blindfold themselves and walk off the "healthy at every carb" cliff.

>source
>>
>>14874284
>>14874317
>>14874340
>>14874367
>>14875144
The cells are oacked with glucose because the lead deficiency makes burning it impossible. (or very difficult)
The worse thing is that is not the only thing, it also causes neocortex shutdown, and the person turns into an automaton with no intellect. They ape, parrot, and can be taught what can be reduced to a sequence of steps, but understanding is impossible and the use of language is rudimentary. Questionss that require reason to answer are answered incorrectly. (Wason 4 card task - the person answers according to the words used, not by meaning) I suppose the most severe cases can be mistaken for drug users due to the limited perception, pinpoint pupils and staring.
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>>14873190
>it is difficult to eat a caloric surplus of protein and fat
Have you ever tried the same on a low fat diet?
To eat 3000 calories on zero fat you have to eat 750g of protein and carb.
It's really hard to do.
>>
>>14873238
The retard anon.
>>
>>14875146
Because boomers and their "fat ass revolution". Newer generations learned overeating, entertainment eating and shit diets.

Fucking boomers and its descendants.
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>>14875567
>Just how losing weight won't fix advanced diabetic nephropathy? What a surprise that if you fuck your body up enough you can't just simply fix it.
Except insulin resistance is entirely reversible for most, the damage isn't that significant, it's just that diet and exercise are a piss poor solution.

>Yes, but the vast majority of cases are fat fucks. We are talking about less than 10%. Most of them either skinnyfat or might just be wrongly diagnosed as Type 2 instead of LADA or MODY.
The vast majority of people in the West are fat fucks. Why don't they all end up diabetic since they're all leading lifestyles that obviously contributed to becoming fat fucks? Magic? Or is there more to it than simply overeating?

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>go to neighbor's place to return something they lent me
>good guy
>invites me in
wife insists I stay for dinner (it's great btw!)
>good kid, excellent marks, SAT
>wants to major in Chem/BioChem/Bio (including med)
>"Anon, what should I choose? I love science but I also want to make money. Being a medical specialist would be cool, but 15+ years in college seems like a lot."

>Me: " . . .uh. Let me get back to you, kid."

I want to help them out because they're good people.
Guys -- which fields in science make big bucks, now?
>>
>>14875519
>you live in an area where there is little demand and you are unwilling to move.
I'm a bong and this is a problem for me, EE salaries are such shit compared to other places in the world. Thankful it's not too hard to move and I hate it here anyway
>>
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>>14873046
just tell him to do CS. if he's not a retard it's the easiest time in the world and they spoonfeed you career advancement stuff (internships, the soft skill bs like networking) from day one at good schools. tell him to be careful though because the "muh full-stack engineer bay area 300k starting" bubble will burst soon and those people will be sent to death camps
>>
>>14875471
>the biggest determining factor should be what interests you the most.
The problem with this line of thinking is that most jobs are uninteresting regardless, and interest is malleable. Even if you're not interested in a field to begin with, you may find it interesting once you start studying it.
>>
>>14873046
Just tell the kid to do what he likes, and if he doesn't know, to find out. $80k vs 100k vs$130k, big whoop, they're all enough to live a comfortable life. And if the kid's smart, average salaries don't really apply anyways.
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>>14877382
Shut the fuck up, the kid needs actual advice, not Reddit-tier truisms

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What do I need to know to pass mathematical analysis and algebra and analytical trigonometry? I am from the southern hemisphere so I start studying in March approximately, from today until that date I have time to study. What knowledge do I need to have to pass analysis and algebra?
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>>14875657
>>14858719
Fucking retard
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>>14875725
do not be rude
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>>14875657
Help me

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how hard is the science on le 90 minute sleep cycles? is it really that accurate for everyone?
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>>14877358
no
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>>14877358
Different for everyone. For me it's closer to multiples of 2. I feel better-rested on 8 hours of sleep than 9.
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>>14877358
Yes and everyone have a different requirement to stay fresh. For me it's 7.5 hours.

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Previous: >>14873002

T-6 hours to impact
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If you had an orbital ring held up with active suspension, would it have to be avn uninterrupted tube all around the planet where some matter could be sent or could it be separated into sections?
>>
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interesting news... rogozin is promoted to be leader of the newly annexed ukrainian territories
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>>14879305
Told you he was promoted. Dude is literally a chadking and Putin knows it
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>>14879305
So he'll be carbombed within a year, got it.
>>
>>14879305
Nice place to have an accident.

If I want to understand quantum error correction what 3 recent papers should I read? Is this paper any good?
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>>14876987
read a hundred papers and find out

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Is Dissociative Identity Disorder real? Can a person really split into multiple personalities?
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>>14874393
>>
>>14874080
Every five years your cells regenerate, so its just every 2.5 years, during your mitosis.
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>>14875983
kys yourself
>>
Dissociative Disorder is a defense system mechanism created by the brain to isolate brain cell highly active and inflamed by traumatic experience to prevent further damage.

To image this , take neurone as a Forest with inter-connected root , if the forest is burning by a trauma , you cut a line of tree around the burn forest to prevent further damage.

But as this consequence , this defense mechanism create an isolated part of the brain with his own connected root , by the time , those neurons rearrange themself to create a brain inside a brain. This fragmentation can go even further when trauma are multiple.

So this pathologie is caused when you don't reconnect and treat with your traumatic experience. And this is why Psychological Cure is necessary to prevent this type of consequence.

I don't have any document to advance this and support this , but i seen this occurrence multiple time.

I would really enjoy if a real psychiatrist can correct me if necessary.
>>
>>14874080
Yes, most cluster B's and even bipolars are technically DID. DID is just parts of the brain being shut off in sense. Like someone with a traumatic brain injury or even lobotomy. In DID however the parts arent actually physically destroyed they are just "turned off." I wrote an article on this topic here for anyone interested.
https://esotericawakening.com/clown-world

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New study out in Nature. English people are 50% Anglo, 25% Insular Celts, and 25% French(!).
https://www.researchgate.net/publication/363736520_The_Anglo-Saxon_migration_and_the_formation_of_the_early_English_gene_pool
>>
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>>14873877
>>14873939
>tfw England was almost called Sexland

https://starkeycomics.com/2019/06/20/england-could-have-been-sexland/
>>
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>>14874607
We do have Cumbrains and Cumbrainland
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>>14872869
this is what some nazis theorized

kek
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>>14875087
That's because those were british lands occupied by the cymri
They have lower germanic ancestry
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>>14876225
YOU'RE FUCKING WITH ME CUNT
Please give me a source on this which Nazi's ???

Mate I came to this conclusion all on my own am I actually a genius wtf ??????

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Friends could you give me a rundown on EE vs ME?

I finished my first year in general engineering, now have to choose between civil, mech or elec when I start second year next week. I've ruled out civil because it seems boring as fuck, struggling to decide between EE or ME

Any help?
>>
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>>14875693
>Also the ME field is oversaturated as fuck
and aero isnt?
lol lmao even
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>>14862881
CS takes the same classes as ME/EE outside the core program courses.
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>>14872433
>If you are more attracted to understanding the theory, do yourself a favor and go study physics.

Studying physics is even more retarded than studying ME, unless you know 100% what you're doing.
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>>14861279
I took ME because i like mechanical solutions etc, but during uni i stated paying a lot more attention to systematic data analysis and therefore did my masters in applied mathematics. Now i work with data analysis at an investment bank. Probably earning way more than the average ME/EE engineer but my point is to not just follow the money, find what you're good at/enjoy and what is needed/useful to your future employers. Learn to self-learn, e.g. if your school only teaches coding in r or matlab, then use the internet to learn some python or vice versa. In closing, remember that your social skills are worth their weight in gold, especially in any corporate environment
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>>14861279
EE will fuck you up

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