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Archived threads in /sci/ - Science & Math - 236. page
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All right /sci/entists? Who here is able to do basic set theory? And who is just here to post memes?

Prove that if X has a smaller (possibly infinite) cardinality than Y, then $2^X$ has a smaller cardinality than $2^Y$.
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>>7691670
Just create a bijection between the smaller powerset and some strict subset of the larger powerset.
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>>7691685

No because an infinite set can be bijective to a strict subset of itself.

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Have a calculus exam tomorrow. What is the reverse chain rule when used in finding integrals? Plz.
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U sub and integration by parts
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You have no fucking life, what the fuck are you even doing. Fuck calculus.
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Fuck math. 2+2=4.

hey /sci/

mech eng student here.
just finished calc3, de, and phy2 this semester and
start actual engineering school next semester.

the load was kind of heavy taking those three...
does it get any easier?
i'm fucking tired.
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>>7691459

Physics/Early Math are cheesecake compared to engineering.
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>>7691468
early math?
calculus 3 and de are not 'early' anything lol.

the math in engineering is just the applies knowledge
from calc 1,2,3 and phy 1,2.
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>>7691459
Jeepers Creepers lad, I took those three along with Organic Chemistry and Lab. You're fucked if that was a heavy load. My advice is to take it easy and take only one or two heavy/core engineering classes per semester, and then two or three of the easier ones ("Communication for Engineers", Computational Methods, Thermo, etc.).

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>galileo sent to court
>gets on his knees and recants everything
>socrates sent to court
>takes a shit on everyone, knowing it will kill him

why are philosophers so based?
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>>7691443
>>>/his/
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>>7691443

Galileo is the father of scientific fraud and nothing more
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Fun little fact not really related though:

It was more or less common knowledg that the earth was round even before galileo. This knowledge was hugely important for navigating the seas.

The only reason galileo got into shit with the church was because he claimed that the earth being round disproves religion. Not that he is entirely wrong on it contradicting the old testament but he clearly overstepped boundries outside of simply claiming that the world isn't flat.

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How come derivatives always use h as the variable? Every book I've seen always has the same formula using h in the proof. Is there something special about h? Why not y or z instead?

$f(c)' = \lim_{h -> 0} \frac{f(h+c) - f(c)}{h}$
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>Is there something special about h?
No.
>Why not y or z instead?
It is convention. Just like functions are often called f and vector spaces V.
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>>7691423
>How come derivatives always use h as the variable

Fermat used "e"
Descartes use tangent circles to find the normal
Leibniz used dx and dy
Newton used "o" and fluxions
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>>7691423
On the picture... why does an investor think he can make money off a derivative?

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We are reprinting what we consider to be the most influential scientific papers in history. Please check out our campaign and let us know what you think.
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Maybe if I put the link in...

http://kck.st/1PsoSfo
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>>7691411
>>7691412

What's the point? What's your goal?

This seems pretentious as fuck and not very useful...
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Do you think non-hipsters will buy it?

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First time on /sci/ so be gentle, I'm trying to figure out specs for a hypothetical engine, I've only learned about volumetric efficiency a couple hours ago so if I'm doing something wrong let me know.
So this is what I'm coming up with
targeted Horsepower: 800 at 8000 rpm
displacement: 311.8 ci
thermal efficiency: .25
Fuel flow: 428.48 pounds per hour
Brake specific fuel consumption: .5356
Mass airflow: 5,356 pph
Required airflow: 1166.75
Required volumetric efficiency: 1.616 (161.6%)
Manifold atmospheric pressure: 48.3532133813"...
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Any advice or ideas are appreciated, or if there's a better board for this just let me know
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>>7691377
/sci/ is mostly just college undergrads circle jerking about stupid math concepts and meme science, try your luck at >>>/o/
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>>7691492
>>7691377
stand by for 2 hours, i can't solve the ex right now, i'll help you later

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Alright /sci/entists
Has anybody had any success convincing others about climate change? My dad was just watching something on Fox News about it, and I got into a big argument with him. What's the best evidence to show them? I didn't have any statistics to hand.

He's a computer programmer, and he has some engineering background, so he's not stupid. I feel like I just need to show him the right evidence. Any thoughts?
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>>7691372
People believe what they want to believe brah
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>>7691372
Well firstly inform him that the carbon we release (not from breathing, but from industrial and commercial activities) is different from the carbon released from nature, such as by breathing, eruptions, etc.
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>>7691372
also inform him that no species has ever disappeared because of how it lived in its environment. Only species that do not adapt are doomed.

However humans are trying to control their environment rather than adapting to its changes.

Hello /sci/. First time posting on this board, I usually post on /b/ or /mu/. At my school, I started up a combat robots club and currently me and my team are coming up with different ideas for what to build and I wanted to hear your opinions with what we came up with. So we decided to go with a horizontal spinner though we're not sure if we want to make it a full-body spinner or a an overhead spinner. The robot will be run on 5-6 NiCad batteries, 2 of them for the drive motors and the rest for the weapon motor. The chassis will use aluminum reinforced with titanium. We're...
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Put the center of gravity and the profile as low as possible. If anything battle bots has ever taught me it's that getting flipped is the most common cause of "death".
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ht-9 or tungsten tips
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>>7691341
Yeah, I've seen that alot, and that's my main concern with most horizontal spinner designs. Would you say attaching magnets to the underbelly of the robot be a reasonable idea or would the sawblades coming up from the ground only ruin them?

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What does /sci/ think about a major in microbiology?

I am currently going for 4 years pursuing a bachelors degree.

Any helpful tips from ACTUAL microbiologist?

also where would you put it in tier status?
from what i hear...its BIG science....what ever the fuck that means...

>bonus points
what about Bio-Physics as well ??
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bump for curiosity
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>>7691295

>nobody bats an eye
> /sci/.jpg
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>>7691295
Uhg I hate wrapping my mind around the concept of very small things. It's kind of boring. But, it is ultimately a study of Biology in a small branch none the less. Just as long as you have a passion for it, Anon.

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Motivate me, /sci/...
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We don't care
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>>7691219
If you need strangers on the internet to motivate you to do something just give up and become a clerk who spends the remainder of his pittance on weed.

That being said, you can crawl out of this hell if you try!

>t. high school dropout who has a masters at 27
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>>7691233
I am also a high school drop out but I start university in January and want to be prepared.

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can someone redpill me on the double slit experiment? My professor said that it was because human consciousness was actually influencing the particles. When I asked him if it was just that the act of measuring the particles necessarily acted on them he said that was wrong. Is human consciousness really affecting reality on a quantum level? seems to retarded to be true, but I don't know enough about quantum physics to have a valid opinion.
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>>7691203
>My professor said that it was because human consciousness
What bum school do you attend
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>>7691203
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>>7691203

It's just self interference of guiding waves

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Live Stream starts Tomorrow

China, UK, America, and others including many of the biggest people in the field will be speaking for 3 days. Includes a panel for SJW to discuss ethics of it as well (recommended not to watch that part).

MIT tech review's latest article on the subject including some mentions of the summit.
http://www.technologyreview.com/news/543541/how-to-really-engineer-a-human-baby/
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I swear I've seen a porn before with that girl in it. (or a girl that looks very similar to her).
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>>7691589
I swear I know that girl.
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>>7691594
she just has one of those faces i guess.

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Is a career in physics really worthy? is it really that hard to get a job after?
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>>7691149
>Is a career in physics really worthy?

If you love physics. If you want money/fame, etc. there are better ways to go about it.

>is it really that hard to get a job after?
If you want to be a professor, yes. Especially in certain subfields. But there are tons of places that employ physicists, you definitely won't be without a nice paying job.
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>>7691170
Thanks senpai
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>>7691149
do physics 1,2,3 and then pick electrical engineering or mechanical engineering,etc

you can always get a BS MS in EE,etc then PhD in Physics

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>november 30th
>year of our lord 2015
>still hasn't snowed once
>75 degrees outside every day
> in northwest pennsylvania

is global warming real? this warm weather is giving me cancer tbhfam
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>>7691140
southwest PA here and it's fairly cold every day. It hasn't been warm in at least a month.
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el nino