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/sci/ - Science, Technology, Engineering, and Mathematics

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New Textbook/Book Request Thread deadbabies ## Mod ## 13/08/25(Sun)06:03 No. 15270 ID: f34135 [Reply] Stickied

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First off, hello there, I'm deadbabies, and I will be taking over as /sci/ moderator. Rules will remain the same. Please use the report function if you see posts that violate the rules, but also do not abuse it.

I have officially expanded the scope of /sci/ a bit. You may discuss Science, Technology, Engineering, and Mathematics here now. No science is discriminated against as long as it's of the peer-reviewed variety. If someone wants to discuss Anthropology or Social Science, by all means, let them. If you do not like it, just don't post in the thread.

The IRC channel #/sci/ is now (finally) re-registered and I am running as operator on here. Feel free to stop by and say hi. I do leave my computer idling on IRC, so check back or leave me a message if you have any ideas, suggestions, or just want to tell me off. You can get onto #/sci/ by joining the server irc.7chan.org at port 6667. You can also use SSL at port 6697 but you will have to set your client to accept invalid certificates.

ADDITIONALLY and IMPORTANTLY I have had several requests on IRC regarding the old Ebook FTP that we used to have. Unfortunately, the mod who ran it entered the military and no longer runs or maintains it. I have no plans to make another one, but if one of you guys would like to, by all means advertise here.

That being said, I'm just going to leave this link here:


You may find what you seek here.

I will be unstickying the old ebook/source articles thread. Please post any new ebooks/source articles here, and feel free to post any working links from the old thread there; I will eventually be deleting it.
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Solutions Manual to E&M, 3rd Edition by Purcell Anonymous 16/11/19(Sat)00:05 No. 16384 ID: 1ae570

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Looking for the the solutions manual to Electricity and Magnetism, 3rd edition by Purcell and Morin. The problems are much more difficult and numerous than in the previous two editions, making it one of the best problem books on the subject. Was able to find the solutions to two analogous books in Classical Mechanics:



Sadly, all my searches for the solutions to the E&M book have been fruitless. It's the last manual that I need to complete my collection.

/cyb/erpunk general Anonymous 17/05/04(Thu)19:59 No. 16494 ID: b47205 [Reply]

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Nosebleed Edition

What is Cyberpunk?
It's complicated.


Cyberpunk Communities
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Anonymous 17/06/03(Sat)21:48 No. 16518 ID: 1d7577

If you're going to argue semantics:

>>You can't fit a human being in a box that's slightly larger than a rat.
Bosavi woolly rat: 82cm 1.5kg
Kimberley Mueller: 26cm 0.3kg

>You can't impregnate a human with rat semen.
Rat (informant)
one who reveals confidential information in return for money

Anonymous 17/06/04(Sun)18:02 No. 16519 ID: 9e6a0a

>Bosavi woolly rat: 82cm 1.5kg
>Kimberley Mueller: 26cm 0.3kg
The Bosavi woolly rat belongs to Mallomys, not to Rattus, which is the genus the word "rat" refers to if not further specified.

>Rat (informant)
>one who reveals confidential information in return for money
Oh, I see. So when you say "rat", you really mean "snitch". That leaves me a bit confused as to why you'd bring up a species of non-human animal, all of which are incapable of snitching on anyone.
Also, the statement "anything that can be done to a snitch can be done to a human being" is either a) tautological, or b) undemonstrable. a) if the word "snitch" refers exclusively to humans; b) if it can also refer to non-human creatures that may capable of snitching at an unspecified point in the future.

Anonymous 17/06/06(Tue)10:30 No. 16520 ID: 21f956

shoo, shoo kalyjew

Storage madness Anonymous 16/08/31(Wed)10:13 No. 16356 ID: f62a88 [Reply]

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Basically, my file/folder organization is pretty non-existent. EG: pictures folder has like 5 subfolders that make no fucking sense.

TL:DR how do you sort out your shit?
and are many fucks given about filenames

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Anonymous 17/01/15(Sun)07:04 No. 16411 ID: 4c82ad


I am also tossing my hat in as a guy who had this idea independently. Mine is probably going to be written using the sfml library in c++ though. I guess a lot of us have similar issues :)

Anonymous 17/01/15(Sun)11:04 No. 16412 ID: ef54e2

Hey, I'm ef54e2.

Would you be interested in working as a team on this? I already have a fully functional viewer and a PoC client/browser for the database, and a server. You can browse a virtual directory structure and open files with the image viewer. The server sends the file contents to the viewer through a socket (entire file resides in the client's memory; streaming is WIP) using a custom protocol.

You can take a look at the viewer code: https://github.com/Helios-vmg/Borderless
The server and browser code is private for now, but I'd be willing to share it with someone interested in working on it, of course. The client and server are written in C# (the server binary can run unmodified on both Windows and Linux) and the database is PostgreSQL.

Let me know, man. I really want to get this done, but my time is divided between my day job, real life, and other projects, so I can never find the time to work on this.

Anonymous 17/05/27(Sat)20:18 No. 16513 ID: dfb7c6

I wish there was an ai that dimensionally organized based off selected properties like all cat pics sorted from long to short cats

So, Pluto isn't a planet. Anonymous 15/07/25(Sat)21:37 No. 16177 ID: b3adbb [Reply]

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I've got news for your son.

That or its really good CGI and NASA has pocked our billions of dollars.

Anonymous 17/05/01(Mon)03:44 No. 16492 ID: 9c4b9c

Looks like a planet to me.

Anonymous 17/05/26(Fri)10:52 No. 16512 ID: 0b50ee

I'm a bit unsure here. I mean that kind of looks like the top of a nasty crusty bald head.

Anonymous 17/03/19(Sun)10:00 No. 16472 ID: 239da7 [Reply]

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So, I have a question regarding physics and mathematics. Between the two, which would give me more "smart sounding shit." I don't mean learning it to brag, I mean stuff like pure mathematics sounding totally abstract to normal people. I just want to be in a different world basically. Kind of like induced autism? Or like a constant high but without drugs. Pic unrelated

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Anonymous 17/05/11(Thu)07:29 No. 16499 ID: 58ed95

When both physics and math get higher it's all written, so neither "sound" abstract.

This was done so mathamitions and physicists would be forced to talk about something else at cocktail parties.

Anonymous 17/05/23(Tue)10:56 No. 16505 ID: cb2135

This is such stupid shit, if you learn a lot of stuff you'll want people you can talk with about it, not to deliberately _not_ be able to talk about it.

Americium 17/05/25(Thu)21:29 No. 16510 ID: 87c258

Meh, fuck it.

Read this, and all of STEM will be within your grasp.

'Physics, Topology, Logic and Computation: A Rosetta Stone', John C. Baez, Mike Stay

Anonymous 17/05/05(Fri)06:24 No. 16495 ID: 97b52b [Reply]

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Why does the frequency of a wave multiplied by its wavelength equal C?

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Anonymous 17/05/14(Sun)23:18 No. 16502 ID: 9e6a0a

Because the wavelength is c divided by the frequency.

Anonymous 17/05/24(Wed)14:41 No. 16506 ID: ca3ad7

Same reason the speed of a car driving in a sine wave will be its frequency multiplied by its amplitude.

You're basically just asking "why does EM radiation move at the speed of light". To which the answer is: "it just does".

Anonymous 17/05/25(Thu)05:01 No. 16507 ID: 5465dc

You're multiplying a rate (/s) by a distance (m) so you get a speed, m/s.

Logic is the 0-truncation of n-Category Theory. Americium 16/11/20(Sun)05:20 No. 16385 ID: ed8b6e [Reply]

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Let's see you normies try to logic your way out of this one.

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Anonymous 17/03/28(Tue)22:05 No. 16477 ID: ae8d22

True: Neither option can answer this question as it requires a yes or no answer. It is true that any answer I give is false, .'. the most fitting answer is true.

Anonymous 17/05/12(Fri)15:19 No. 16500 ID: ae6f04


Anonymous 17/05/12(Fri)15:19 No. 16501 ID: ae6f04


HELP!! Anonymous 17/05/01(Mon)00:01 No. 16490 ID: e202d0 [Reply]

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Can someone explain a quadratic equation in a way that makes it more intuitively understandable? My algebra teacher just rambles endlessly about unrelated shit.

Anonymous 17/05/01(Mon)01:02 No. 16491 ID: 64fdd2

shit's basic math bruh but your time would be better spent going to khan academy

Anonymous 17/05/02(Tue)07:52 No. 16493 ID: 9e6a0a

A quadratic equation is an equation that can be rewritten into the canonical form

0 = a*x^2 + b*x + c

where a, b, and c are specific constants and x is a free variable. A quadratic equation has at most two solutions (a solution is a value of x that makes the equation true) in the real set, but it may have one or no real solutions.

Any quadratic equation in the canonical form can be solved using the quadratic formula:

-b + (+/-square_root(b^2 - 4*a*c) / (2*a))

Note: if b^2 - 4*a*c < 0, then the equation has no real solutions. If it's zero then it has a single real solution. Otherwise it has two real solutions, given by the positive and negative square root.

Really Anonymous 17/04/06(Thu)10:17 No. 16482 ID: 55153b [Reply]

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I just wanted to make cool simulations and maybe invent something I dont know

So I downloaded Openfoam and apparently you need to be a master computer scientist just to be able to even start the program? How can I make things like pic related but easier?

Anonymous 17/04/22(Sat)00:03 No. 16487 ID: 643b6c

blender can do fluidsimulations, fogsimulations, flamesimulations.

Anonymous 17/05/25(Thu)05:04 No. 16508 ID: 5465dc

SketchUp will let you easily build models. Pretty sure you can import them into better simulators.

Future invention timeline Max 17/04/16(Sun)05:07 No. 16486 ID: 11e346 [Reply]

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Can someone help me create a timeline from 2017-2050, with each year having one future invention? One invention per year, from now until 2050. You don't have to explain how it works; just be creative.

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