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Archived threads in /sci/ - Science & Math - 80. page
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can a person possibly die from pure sadness?

Science
>>
stress raises heart rate among other things which may aggravate a pre-existing condition
>>
>>8465671
Yes, by choice. Pity ploy gone wrong. The mind of a psychopath runs on wishful thinking.

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Is it possible to become well-versed in a subject without getting a degree in it? Or will I forever be a backseat, say, physicist or mathematician who thinks he knows more than he actually does?
>>
no one was ever well-versed in anything until degrees were invented
>>
>>8465643

/s
>>
>>8465631
you will be a backseat nobody who thinks he knows more than he actually does, but not because you don't have a degree

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So if i went back in time with my lover, and gave birth to myself. And then my childrens lover went back in time to give birth to themself, which is still myself. What does that make me? mother/father of my own creation?
>>
the grandma/grandpa and child are the same person...
>>
>>8465579
You can't go back in time.
>>
>>8465579
Souls don't exist so you can't transfer yourself by magic into your clones just because they happen to share your DNA.

A clone isn't you, brainlet.

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How does this problem work, /sci/
It seems like it ought to be straightforward
>>
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60 Degrees for each angle.
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>>8465460
Yeah I know what equilateral means.
>>
>>8465460
How does that relate to the problem??

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>in calculus 2 class
>doing parametric calculus problems
>have to find where graph has horizontal asymptote
>girl next to me asks for help
>tell her to take derivative, set numerator equal to zero
>she tells me not to use terms like "numerator"
>i have to explain to her that the numerator is the top half of the fraction
>later...
>>
>>8465390
>>math
>>girl
>>
>>8465390
Are you 13?
>>
>>8465390
>"horizontal isotopes"
What did she mean by this?

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Hi, i'm making researches about the Us navy Railgun and i was wondering if someone has some data about it .
>>
>>8465368
fucking magnets
>>
Bump it
>>
Pls go north korea

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Is this statement true?
∀k ∈ N ∃l ∈ N : l < k
I think not, because if you choose k=0, then there should be no l left to be smaller than that. Am I correct?
>>
>>8465186
Er even if you choose k=1, then l must be 0 for which it is not defined.
>>
>>8465196
>>8465196
Implying $0 \not \in \mathbb{N}$.
>>
>>8465186
>I think not, because if you choose k=0, then there should be no l left to be smaller than that. Am I correct?

If you found a counter example then why the fuck did you make this thread?

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There are people on this board RIGHT NOW - and in fact there's plenty of them, not just one or two weirdos - who ACTUALLY and completely UNFACETIOUSLY went to vote. That's right. They went to vote.

I cannot for the life of me find an example of MORE BASIC MATH than
> one divided by SIXTY FUCKING MILLION is a statistically negligible number

This obvious fact is not a factor in all these people's reasoning.

How does that make you feel?
>>
wow op u r so smart hehe xddd what a patrician hehehehe fuck the plebs amirite xddddddddd us mathematicians amirite?
>>
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>>8465086
> it takes ~1 minute for a mindless libcuck on /sci to get triggered and announce it
Good to know.
>>
>>8465096
>libcuck

Perhaps you'd feel more at home a board more your intellectual speed: >>>/pol/

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What are the most Important topics to learn about besides physics? Thanks!
>>
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>>8464927
Computer science.
>>
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>>8464927
>>
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>>8465313

What is the point of studying pure maths or physics if your IQ isn't above 150? You will never make discoveries or become world renowned with your inferior IQ. Just do engineering or computer science and call it a day.
>>
>>8464704
No point in studying pure maths in general, unless you want to be an autistic cuck faggot
>>
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>>8464704
>implying
t IQ 115 at most

>>8464789
Rude af!
>>
>>8464704
Who is this cum drum?

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Where were you when statistics stopped being a STEM?
>>
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>>8464647
What's his name again?
>>
>>8464647
He is a massive fag, and he is truly BTFO.

Stats has been passed by modeling. AI modeling and the Primary Model predicted the outcome correctly.

Polling and statistics are just a means for the media to favour its favourite candidate now.

Fuck Nate Copper and his shitty math. Go back to school Nate.
>>
>>8464833

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Do you think large cells have circulatory systems and "heartbeats"?
>>
>>8464270

No, because I'm not mentally retarded.
>>
>>8464280
Why would thinking that cells have synchronized transport capabilities confined to specific pathways be retarded?
>>
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I think the better question is, do multi cellular animals the size of unicellular amoeba have a circulatory system and heartbeat?

Seriously, how does something this small even function?

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Only a few more hours until america is made great again!

But seriously, lets get to the point.

If Donald Trump wins the presidential election, what scientific advances can we hope to see?
>>
Not many since he plans to cut funding to NASA's earth science departments.
>>
A total war under Hillary would lead to greater scientific progress
>>
He's too busy collecting money to be interesting in things

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why is it in leibniz notation a second derivative is noted as

d^2y/dx^2

and not

d^2y/d^2x ?
>>
Because d/dx is the operator. When you apply it twice you get what everyone uses.
>>
>>8465388
so it's squaring the operator, which i understand through d^2y, but how is it with respect to x^2? doesn't that imply your variable has to be second order?
>>
>>8465405
(d/dx)(d/dx)=d^2/(dx)^2

There you go.

Does anybody have a good collection of published research supporting/opposing global warming? And if supporting, proposed solutions. I really can't make a decision on this topic until I read more, but I don't know where to start.
>>
>>8465029
Wikipedia. The consensus for solutions right now is damage control. Too late to stay within the normal climate cycle, but the degree of deviation can be minimized with immediate action.

https://en.m.wikipedia.org/wiki/Climate_change_mitigation
>>
>>8465029
>I really can't make a decision on this topic until I read more
>99% of scientists agreeing doesnt convince me
>Im a skeptic
sure thing buddy, but Ill just call you retard all the same. also if 99% of scientific consensus isnt going to convince you, literally nothing will
>>
>>8465034
>the degree of deviation can be minimized with immediate action.
dude, TRUMP won. Digest that for a bit. The guy who said global warming was a chinese hoax.

literally every last bit of fossil fuels will be burned and blown into the atmosphere. we are going for maximum damage and there is nothing anyone can do about it

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HP-50g
TI89
TI84

Why is HP-50g better than the rest?
>>
Nspire is the best calculator
>>
>>8465036
I never understood why anyone would need a CAS calculator.
Why not just use a computer instead?
>>
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>>8465040
This.

Hi /sci/ if our universe is always expanding is there a centre point?
Also if its expanding will it eventually reach a point where it collapses on itself? Could it be possible that there was possibly another universe before us and the big bang was caused by the universe collapsing, not being able to expand any further?
>>
No center point. Any finite amount of space is expanding. Infinite space is becoming less matter-dense.

Space is expanding beyond the escape velocity of the gravity of all matter in the universe, there will be no big crunch.
>>
>center point
No
>Collapse
No
>Cyclic Universe
No

The universe is infinite, now take time to understand what the word "infinite" means, and how it applies to this context.
>>
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>is there a centre point?
all mass has a center

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Daily reminder that this man will extend our lifespans by 2036, and eventually lead humanity to eternal youth. Why have you not donated to the SENS foundation yet? Don't get fucked over by aging just because some memers tell you that "it's 100% natural we can't stop it".
>>
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>>8464778
I wish I never found about this life extension meme, now I'm just going to be left disappointed. Hopefully I'm wrong.
>>
>>8464905
I found about it several years ago in a science magazine that talked about the 10 keys of aging according to him.
Was there any progress on this?
>>
>>8464778
He does fucking nothing except raise money. Why would I want to live longer now that trump is president

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Yo sci can you give me some cool subjects like Fermi paradox or Kessler syndrome
>>
Preferably related to space out astronomy
>>
>fermi
>>>/x/

Fucking pop-sci normie. You want a good topic? Differential geometry.
>>
>>8464800
this

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Is this even remotely correct?
>>
>>8464333
>History is rewritten and used merely as a tool to influence how people view the present
>Religion is excluded from the public square

Only fedoras think that way
>>
>>8464333
This is just a very wordy strawman
>>
>>8464353

I agree. The author uses most terms wrong or terms that are dog whistles for the religious right. (metanarrative, evolution, social disease, moral relativity...) They seem to be chosen for their colloquial newspeak.
It is peppered with religious dogma from an evangelical Christian point of view, not theological arguments from all religion.
("propositional revelation from God", "building blocks for higher criticism of the Bible.")

Bullshit strawman, and "No true Scotsman"...

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So this guy:
>Has a 5.0 GPA
>Scored a 2100 on the SAT
>Got accepted into every ivy league school
>Plays baseball
>Plays 3 instruments

>>
>>8464315
hes a nigger
>>
>>8464331
Exactly, a nigger did that and you can't.
>>
>>8464315
its almost like the difference in IQ spouted by /pol/ is marginal at the extreme ends of the scale.

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I recently finished James Stewart's Precalculus, I know I should move onto calculus but I'm not sure which book to use. I was wondering if any of you could give recommendations based of your experience with a certain book, thank you all in advance.
>>
you could just stay the course and stick with stewart, but he's pretty unpopular here because his calculus text isn't an analysis text in disguise.
>>
>>8464263
I've heard plenty of people on this board say that Stewart's book is not good if you are studying math for math and nothing else, is this true or is it just a lie? Would it be best for me to use this as some sort of introduction to calculus the use another text that is more proof based than application based?
>>
>>8464276
I learned Calculus with Stewart's book. Is it good enough? Yes, sure. Are there better books? Definitely.

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Easy C++ concept I can't understand can anyone help me write this program?
Write a program that prompts the user to enter a positive integer. The program should then output whether it is a triangular number or not. Include a function to validate the input and a function to test if the input is a triangular number or not.

I feel extremely dumb and just want to know how to do this for future reference. Thanks in advance
>>
>>8464241
#include <iostream>
using namespace std;
bool isTriangular(int);
int main()
{
int x;

cin>>x;
return 0;
}
bool isTriangular(int x){
this is what I have so far
>>
The formula for triangular numbers is n(n+1)/2
Just do the reverse to see if you end up with a positive integer.
>>
We all feel lazy sometimes but you should really make a bit more of an effort with this extremely baby assignment. Programming is one of the most important life skills you can learn.

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Holy shit. The memes about CS really are true

>be me
>first term math student
>studied CS before for two semesters, but switched majors because I soon realized that it's a meme degree
>be in linear algebra, a class most students of math related majors take in the first term, but CS students in the third term
>get handed back corrected assignments
>I'm the only one with a perfect...
>>
why are the math and CS students taking the exact same math class ? Aren't math students supposed to have advanced math classes ?
>>
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Did you really start CS thinking it would be maths-intensive? That's stupidity on your part. Your classmates were shit at it because they assumed they could get by with high-school level math, which isn't that far from the truth.
>>
>>8464238
In my university (and in many other unis in Germany), the first two math classes analysis and linear algebra are attended by students of math, physics, CS, MFE (mathematical financial economics),... Only later are there separate classes

>>8464246
I didn't expect it to be maths-intensive (though I did expect a little bit more math than I got), but I expected the non-math classes to be harder. They were a fucking joke compared to the math classes. I knew...

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>walk in
>see this
>what do
>>
>>8464097
question why the moon is a tiny earth clone on both of those realities
>>
>>8464097
What happens if the wormhole closes right when you're passing throught it?
>>
>>8465344
A new big bang and a new universe.

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How naturally talented do you have to be in math to become a physicist? Is a desire to work extremely hard worth anything, and could it be used to compensate?

I'm a 26-year-old MD/PhD (currently doing PhD in computational biology) thinking of quitting my MD/PhD to pursue a career in theoretical physics. I've always been interested in math, and I loved physics, but I was never stellar in either subject. I had to work hard, mostly because I rarely knew how to limit myself and often wanted to know exactly how things worked rather than accepting simplified explanations.

>>
bamp
>>
if you do this you are quite retarded.
at least finish your phd before getting assraped by theoretical physics and killing yourself
>>
>>8464102
>getting assraped by theoretical physics and killing yourself

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>What do you think of this /sci/?

A recent concern in psychological science is that many statistically significant findings, including some classic findings, do not replicate.

This problem is not unique to psychological science. The landmark article “Why Most Published Research Findings Are False” (Ioannidis, 2005b) was relevant to all scientific
research.

>>
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FINDING 1: ALL PSYCHOLOGICAL TRAITS SHOW SIGNIFICANT AND SUBSTANTIAL GENETIC INFLUENCE

Psychological domains traditionally focused on individual differences are those that have been studied most frequently with genetically sensitive designs, primarilythe twin method in which resemblance is compared in pairs of identical and fraternal twins: cognitive abilities
and disabilities, psychopathology, personality, substance use and abuse, and health psychology. Traits in these domains have consistently shown significant genetic influence in adequately powered studies

Although...
>>
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FINDING 2: NO TRAITS ARE 100% HERITABLE

As noted earlier, heritability estimates are substantial, typically between 30% and 50%, but this range of estimates is a long way from 100%. Again, we are unable to find any excep-
tion in which the heritability of a behavioral trait is near 100%. However, this is not a limitation of the methods, because some traits, such as individual differences in
height, yield heritability as high as 90%. It should be noted that behavioral traits are less reliably measured than physical traits such as height, and error of measurement contributes to nonheritable variance.

Although this finding might seem obvious and unsurprising, it is crucial because it provides the strongest available evidence for the importance of environmental influence after controlling for genetic influence. Because
genetic influence is significant and substantial, one must control for genetic influence when investigating environmental influence.

Environmental research using genetically sensitive designs has led to three of the most important discoveries about the way the environment affects behavioral development
>>
FINDING 3: HERITABILITY IS CAUSED BY MANY GENES OF SMALL EFFECT

Powerful but overlooked evidence that many genes affect complex traits including behavior comes from selection studies in nonhuman animal research. If only a few genes were responsible for the heritability of a trait,
selected lines would separate after a few generations and would not diverge any further in later generations. In contrast, selection studies of complex traits show a linear
response to selection even after dozens of generations of selection, as seen, for example in one of the largest...

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so I was browsing videos on youtube and checking if there is anything related to my new most favourite may-may™ and stumbled over an interesting problem.
So let's say you play a video which is 100 seconds in length and every 10 seconds you play the same video but with the same condition except it's at double the speed of the previous video. So it's recursive.
At the start you should, for example, quickly get a stack of "paused" nested videos which are all waiting for the video one layer below to finish playing.
So the question is: Does the...
>>
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>>8463816
>So let's say you play a video which is 100 seconds in length
>Does the whole video have a finite length?
how is that a question?
>>
>>8463830
well that's an interesting point you raise
>>
>>8463830
>>8463844
oh actually that's not really a problem, I was just retarded for a second.
You have 100 seconds of video footage you use. The length of the assembled video at the end is unknown.

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https://www.nasaspaceflight.com/2016/11/nasa-working-group-orion-esm-schedule/
>be NASA
>contract out 1 (one) part of SLS to Europe
>that part is based on 95% pre-existing hardware
>Europoors are so shit they can't even get that part finished
>delays the entire project for potentially years
>the Saturn V class rocket is ready to go in 2018 but the tiny service module apparently is too...
>>
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>USA did this in 2012
>Europe can't land a pizza platter with a parachute on Mars in 2016
>>
ESA has roughly 1/4 of NASA's budget and lack even remotely the same experience with space flight in general. That's pretty much why they're nowhere near as good as NASA is.
>>
>be nasa
>see spacex cutting costs by 10x with vertical integration
>be required by congress to use thousands of shit contractors

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What is the simplest way to break human bones without using any extra equipment suck as sticks? At what angles and how do you press the limbs against the joints for the easiest result? What about fingers? Torso bones such as ribs?
>>
Ribs need impact. Everything else can be broken on the principle that ligaments (which hold bones together) are in the main, stronger than bones. Think of the range of movement they least want to go into. So you can hyperextend an elbow, or twist a wrist. Knees will tend to give out in the ligaments first, and ankles are tougher, they can tear ligaments or avulse (pull off a bit) bone or break bones, if stamped on, eg football players.
>>
>>8463620
I need more specifics. In case of breaking a leg for example, would the way to do be to step on it below the knee and then jerk it up and to the knee holding it above the foot?
>>
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