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# /sci/ - Science and Mathematics

Go STEM or go home.
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No.34[Reply]

Welcome to /sci/. If you're here for homework help go to >>>/hwk/. If you're here for religion or politics, fuck off.

Post last edited at

File: 26c9d93561824d7⋯.png (578.51 KB, 999x1031, 999:1031, MathematicaSpikeyVersion8.png)

No.5469[Reply]

What are some good trackers for academic software?

File: b901a089a6f9f8a⋯.png (90.5 KB, 645x729, 215:243, brainlet.png)

No.4963[Reply]

I have n number of marbles and n ≤ 100. If I group the marbles into some groups of three, I will have

2 marbles left that belong to no group. If I group the marbles into groups of five, I have no marbles

left. But when I group them into groups of seven, I will have 4 marbles left. How many marbles that I

actually have? In other words, determine the value of n

22 posts and 5 image replies omitted. Click reply to view.

No.5441

>>4968

#include <stdio.h>int main(void){	int i, ocd;	for (i = 1; i <= 20; ++i)                ocd = 5*i ;		if (((ocd- 2) % 3) == 0)			if (((ocd - 4) % 7) == 0)				printf("Solution is %d\n", 5*i);	return 5*i;}

No.5444

Mod(x-2,3)

Mod(x,5)

Mod(x-4,7)

95.

No.5450

>>5433

I'm sorry. I genuinely don't get the joke here.

Are you praising him for still using C or are you mocking him?

No.5451

>>5431

How does one algebraically solve this problem without any blind trial and error?

No.5468

>>5428

anon, I know you already found the answer (and probably aren't checking this board anyways) but the lines wouldn't use the same variable, because the number of groups of 3, groups of 5, etc. are going to be different. It's y (the solution) that will be the same between them.

File: c5dc5658934e72e⋯.jpg (353.71 KB, 662x572, 331:286, 19_20170525230021992_20170….jpg)

No.5466[Reply]

is there enough room in our solar system for a second star? the unique radiation might cause some interesting effects. maybe such a device planted in deep space could also create something like this.

File: 1a8a46c20dc5f4f⋯.jpg (114.78 KB, 475x329, 475:329, mmw-women-math-041412.jpg)

No.5445[Reply]

Why are women surprisingly able in Math? In all the other STEM and intellectual subjects, the disparity between male and female ability is significantly greater.

No.5446

Different kind of problem is solved at math than at different sciences, also it may be distribution.

No.5447

I suspect of the few women interested in math even fewer are interested in science / engineering. As for actual ability in any given field I don't think there is any real difference in ability. It would be interesting to see "average skill grading" for lack of a better term of women and men working in STEM. I honestly suspect that men may test lower on average due to many men being draw to STEM for the pay rather than any real interest leading to them doing the bare minimum in their work.

No.5465

Just guessing but mathematics allow problems to be solved by sign manipulation and language rather than spatial thought.

No.5467

Please specify level, because I've seen none at the graduate level, except some Chinese.

File: 18af674c328e722⋯.jpg (5.23 KB, 261x193, 261:193, Nanitf.jpg)

No.5464[Reply]

>Friction is a non conservative force

>Friction arises from electromagnetic forces acting on atoms between two surfaces with relative motion between each other

>Electromagnetic forces are conservative

>MFW

File: 1ef6f9a9ed5d5bd⋯.jpg (43.91 KB, 650x366, 325:183, I-Have-No-Idea-What-Im-Doi….jpg)

No.5411[Reply]

Can we have a thread that discusses what exactly intelligence is and how it is measured? Most of the discussion I see here about intelligence is centered around group difference in IQ, and sometimes the heritability of IQ and the effects of IQ. But sometimes I have a feeling that many of the papers mean less to me when I don't have a good enough understanding of what exactly intelligence is in general. So I just want a thread discussing questions such as: (this is gonna be a long list by the way).

>what is intelligence? What is IQ? Is IQ the same as intelligence?

>what is the difference between intelligence and personality?

>What is g-factor, and how is it different from IQ and intelligence?

>what are the different theories of intelligence, and which ones are more accepted by academia?

>what is EQ and is it important? I see most people shit on EQ, but I still see a lot of papers mentioning EQ when I look for IQ on google scholar

>Where can I get a better understanding of psychometrics?

>What is the current state of research in IQ? Which subjects are they focusing on? Any new theories or old ideas being phased out? General consensus?

>How accurate are certain IQ tests? What external factors could influence test results?

>What the fuck is factor analysis? How is it calculated and what do the values mean?

>What is heritability and what is its significance?

I know that it does not mean that X% of your IQ comes from your genes when IQ is X% heritable, but rather that 50% of the variance in IQ in the general population comes from genetics. But I'm not sure about its significance since for one thing, the environment could change or be different in different parts of the world, thus having a different effect. How does epigenetics play into this? What's a more intuitive understanding of heritability of IQ?

Basically anything that helps people understand what they're looking at when reading and IQ study, things that give people a broader undPost too long. Click here to view the full text.

1 post omitted. Click reply to view.

No.5422

Wikipedia has an "outline of human intelligence" which I think might be a good place to start.

https://en.wikipedia.org/wiki/Outline_of_human_intelligence

It's not well organized, and some of the things listed there aren't popular theories in academia. But to get some background information quickly it might work.

No.5435

File: ca2292564cc1ce6⋯.jpg (36.21 KB, 736x233, 736:233, intelligencescale.jpg)

File: f9d5a16a1ffc355⋯.png (126.83 KB, 2500x2124, 625:531, intelligencestaircase.png)

No.5438

>>5411

Ability of solving a puzzle determined by genetics…

It's time to put some newborn in a box with no stimuli at all to prove you wrong.

No.5440

>>5411

IQ is probably just measure if you experienced and noticed similar problem and way to it's solution. If somebody explained you similar problems or functions required to solve this problem, your ability to solve them is higher than of those who haven't encountered anything like that.

However experience matters and those problems are problems mostly consisting of set theory and some topological transformation, which are operations by which we probably think, and even computer does.

However in real life thing you expect with this style of thinking may not be best, because tomorrow is not picture 4 and you may not have data what happened in previous pictures. Uncertainty is a bitch.

No.5463

Too busy atm to participate much, so I'll just clarify for EQ since I find it's just bs from the moment I heard it.

(Before you read, this isn't about EQ 100%, nor do I know how EQ tests work, but from my own intuition on modern-day shittery, I bet I'm not really off…)

EQ, while great in an unbiased hypothetical fashion that isn't attempting to relate to abstract "emotional intelligence", is bad in both theory, and exponentially worse in practice.

Take this into consideration:

For every person there's a different personality, that is influenced by the way we were raised, the things we've gone through in life, the things we've learnt in it, and in part by genetics

(think of genetics in IQ and also personality as being the unchangeable way of thinking part, or the base in math for counting and addition/subtraction, before learning multiplication/division, exponentiation/roots, tetration and other stuff)

Thing is, EQ by large part is based on, at least from what I know: what's morally good, how your decision affects others and whatnot.

I may be wrong, haven't taken an EQ test myself, but what I'll say now I'm pretty sure still applies…

Let's say, someone has one defined personality, a friendly one, who socializes well and respects others regardless of whatever, and supports them whenever they can, they're likely to have a high EQ, right?

But then, there's also someone, who let's say, has a manipulative, astute personality, like a "pupeteer"/mastermind of sorts

One could argue, the "mastermind" would act the same as the friendly one, but for an end goal of getting what he wants, therefore, he masquerades as friendly and such all the way to the end, and possibly even then.

He'd likely get a similar EQ from responding similarly, or if EQ questionaires test for such, they'd likely get lower, becauae they're not moral to snowflake standards.

But, wouldn't it in reality, be quite higher?

I mean, being able to manipulate likePost too long. Click here to view the full text.

File: 7c3a77f6d7a13e5⋯.jpg (6.95 KB, 480x360, 4:3, hqdefault.jpg)

No.5413[Reply]

Does 0^0 = 1?

Make your case, why or why not. If not, what should it be defined as?

2 posts omitted. Click reply to view.

No.5423

actually 0^0 is not defined. It is often assumed 0^0 = 1 for specific theorems and statements to be shorter.

No.5424

It's an indeterminate form, https://en.wikipedia.org/wiki/Indeterminate_form

Go here: http://fooplot.com/ and put in the following equations to see why.

We can all agree 1^x is 1 for all x. (put 1^x in as a function)

There are two forms of functions involving exponents: power functions (e.g. x^2) and the exponential functions (eg. 2^x)

Power functions:

As we reduce from powers greater than one to powers less than one, the shape of the curves change. Compare x^2 and x^(1/2). As we decrease the exponent, we get a "sharper" corner on the curve near x=0. Try it: x^(1/10) then x^(1/100) then x^(1/1000) and so on. That "sharp corner" appears to approach 1 as we decrease the exponent towards zero (x^0) but never quite reaches it until we increase the denominator to infinity (hence, an indeterminate form). If we imagine going all the way to infinity, then the curve would straight vertical from 0 to 1 at the origin, and then a 90-degree turn at y=1. So, 0^0 would equal every number between 0 and 1, which is silly.

Exponential functions:

As we reduce the base of the exponential function from bases greater than one to bases less than one, the shape of the curve reverses horizontally (compare 2^x and (1/2)^x). As we continue decreasing the base, we see that the function starts to get a "sharp corner" going towards the origin. Try it: (1/2)^x then (1/10)^x then (1/100)^x then (1/1000)^x and so on. If we imagine going all the way to infinity, then the curve would be a vertical line going from 0 to infinity at x=0, and then a 90-degree turn at the origin and the curve would be y=0 everywhere else. So 0^0 would equal every number between 0 and infinity, which disagrees with the first result we derived above, and is silly anyway.

No.5425

>>5423

Many people have defined 0^0 and the usual definition is 1 for various reasons. It is far from «not defined».

>>5424

You would only call it an indeterminant form if you got 0^0 by taking some limit and plugging in 0. Even then, 0^0 has a well agreed-upon definition so you would just say that the exponential is not continuous at (0,0).

>We can all agree 1^x is 1 for all x. (put 1^x in as a function)

>Ad-hoc argument from limits of sequences of functions.

This is why it's wrong to attempt to teach kids calculus before they have a solid grasp on algebra. You get bizarre arguments that hinge on some analytic property holding in a case that it clearly does not when the whole context was about something elementary.

No.5458

>>5413

It’s zero because any fraction where zero is the numerator is zero, is zero.

No.5462

Lets look Taylor sum of exponential function: $\Sigma_{i=0}^\infty x^i /i!$

If this make any sense, then 0^0 has to be one since exponent fuction is one at x=0.

File: cb72d7df7bb4c3d⋯.png (16.67 KB, 120x68, 30:17, IQ-Mindware-logo-1.png)

No.5453[Reply]

has anyone tried/ have any idea if these things work?

https://www.iqmindware.com/brain-training-apps

https://www.brainhq.com/why-brainhq/brain-training-your-way/brainhq-courses

any other resources I should look into?

No.5459

The basics:

Get enough sleep. Sleep dep gives you brain damage. (The book Why We Sleep is a great resource.)

Get enough exercise. Cardio literally grows new brain cells. (https://en.wikipedia.org/wiki/Neurobiological_effects_of_physical_exercise)

Make sure you aren't suffering from chronic inflammation.

If you feel depressed, anxious, forgetful, distracted, lack willpower, there's a good chance you are.

Inflammation has a devastating effect on the brain.

Inflammation means your immune system is pissed off.

You usually experience it when you're sick, but certain foods cause it too.

Refined sugars, vegetable oils, omega-6, and in some cases, carbs in general.

I didn't realize what a huge difference it made until it went away. And when I broke the diet to see what would happen, I felt like absolute shit, and couldn't believe I used to live like that all the time.

An easy way to check, is to stop eating everything inflammatory for a few days and see how you feel.

I recommend the beef-only diet (no, you won't die), but beef and greens should work in most cases.

Once you stop giving yourself brain damage, check out Dual-N Back. It trains your working memory.

Best wishes

No.5461

>>5459

thanks anon.

how long have you been doing dual-n-back?

did you notice any effects?

File: e90336aa1f24b27⋯.png (95.04 KB, 616x174, 308:87, sci.png)

No.5448[Reply]

Is this beautiful trap really going to teach me about Quantum Physics? Or is it a scam?

No.5452

Either way it's a waste of time, just download a book.

No.5460

It's an advertising to Brilliant app

File: c14dc4cf5080604⋯.jpg (1.38 MB, 1835x1087, 1835:1087, mathematics-chalkboards_00….jpg)

No.5457[Reply]

sqrt(ab) = sqrt(a)sqrt(b)

sqrt(a + b) ≈ ?

Find the most elegant, useful, and accurate simplifications.

File: d08aca249640edd⋯.jpg (1.95 MB, 2423x3632, 2423:3632, science-3.jpg)

No.5385[Reply]

Time to start this board again.

2 posts and 5 image replies omitted. Click reply to view.

No.5388

File: 9db4f7b8bab220b⋯.png (88.82 KB, 1000x593, 1000:593, 1479024184253.png)

File: bdf0f6038aa3fb0⋯.gif (8.23 KB, 383x375, 383:375, 1444529156140.gif)

No.5389

File: ffc2d4089c07e77⋯.png (87.43 KB, 1134x1333, 1134:1333, 46235.png)

File: 3058ad70b0d5e4c⋯.png (1000.62 KB, 976x4412, 244:1103, 725.png)

No.5392

File: 09c8c8913d42580⋯.png (156.67 KB, 516x440, 129:110, prisonschool84.png)

>>5385

Has the boot procedure succeeded, son?

No.5396

File: 2eae6b251aa0ef3⋯.jpg (43.52 KB, 401x574, 401:574, 1525021913519.jpg)

>>5385

agreed

No.5449

>>5387

My advisor had that first one as a big poster hanging up in our old lab.

File: 0e6d200cf92cadf⋯.jpg (41.33 KB, 600x462, 100:77, 1457026481959.jpg)

No.5400[Reply]

¿Does anyone here speak category theory?

No.5403

Go to /tech/ and ask for a certain Mr.Haskell, they'll help you

No.5426

sheaves my friend, sheaves

No.5442

>>5426

Do you actually have anything to say or are you that one undergrad who memorized a handful of mathematical phrases and spews them out randomly?

No.5443

>>5442

I am an old faggot undergrad and I have a cat named Linus

He's awesome

He is the chillest cat of all time

Also I suck at math, taking remedial 0995 now but am taking Biology and Public Speaking and some sort of landscaping class

All As so far

I'm going to get recruited for the Space Force

File: 34073bc7dd7ff33⋯.jpeg (324.44 KB, 2000x2000, 1:1, light.jpeg)

No.5432[Reply]

Let's assume, light is travelling at c.

Traveling means changing coordinates.

Where do we measure that time in which distance between coordinates is changed?

No.5434

No.5436

>>5434

I mean where all this stuff happens.

Let's say we have two parts of space with different time dilatation.

I measure the pass of time in one part and measure time in another.

Light suddenly going over "c".

Which is appropriate observer for speed measurement?

No.5437

-"Hey dude, your light is going too fast."

-"Mr. Officer, you are using time traversal speed of Greenwich in your equations, but you observed me in much heavier situation, you can't give me fine."

File: 9880a7a3da121d5⋯.jpg (6.63 KB, 180x279, 20:31, download (1).jpg)

No.5404[Reply]

Thoughts?

No.5405

I don't have a lot of patience for philosophy personally, but some may enjoy it.

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