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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.
Message too long. Click here to view the full text.

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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.

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


Anonymous 17/08/14(Mon)01:35 No. 16536 ID: 45f007

What would happen if Pinocchio were to say, "My nose will grow right now."?

Anonymous 17/08/15(Tue)07:32 No. 16537 ID: c1b3cc

b) False

"False" is not the same as "false".

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 17/05/23(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

The owner of the CIA says howdy Joshua+Paul+Lee+Roy+Bietz+MD+Neurochemistry 17/08/09(Wed)23:29 No. 16535 ID: f8b2a3

Physics on account of exotic entities like black holes. Astrophysics is known as an exotic hard science, as is Cosmology. They just sound cool on the lonesome there of. Nuclear Physics and Particle Physics and Chemical Physics and Subatomic Physics just sound cool also. Muons, gluons, quarks, and the like also sound good. I do not know why, probably because I know more about it, but I believe Physics has more pizzazz than mathematics.

creating fake money Anonymous 17/07/25(Tue)16:01 No. 16529 ID: d4675d [Reply]

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Hey guys, want to create counterfit Euros. No, I'm not dumb enough to use them, I want to give them to an unsuspecting victim in exchange for genuine bills.

I have a inkjet printer and scanner. What to do?

Anonymous 17/08/05(Sat)12:16 No. 16533 ID: ff4656

kind of go and fuck yourselves... sincerely: everyone.

Anonymous 17/08/05(Sat)12:48 No. 16534 ID: 40ad14

Go ask Interpol.

One question = many answers Eeee 17/08/02(Wed)09:32 No. 16532 ID: 7995e9 [Reply]


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?

4 posts omitted. Click Reply to view.
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.

Anonymous 17/07/12(Wed)09:08 No. 16524 ID: 3b41a8

Infinity in a Reimann universe is equivelant to -1/2 +- sqrt(1/12)

The owner of the CIA says howdy Joshua Paul Lee Roy Bietz MD Neurochemistry 17/08/02(Wed)00:09 No. 16531 ID: e6c346

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c=nu*lambda; nu=frequency and lambda=wavelength
The unit of frequency is cycles per second and that of wavelength is a displacement. Therefore, dimensional analysis provides you with displacement per second. Also, many electric and magnetic fields travel at speeds different from the speed of light, both faster and slower. Faster ones make it out of black holes, which ones depends on the escape velocity of black holes. The question you want to ask is how can we know theoretically that the matter eaten by the black hole conducts, and well, which we know from the electric and magnetic fields that escape from it near the axis of rotation.

/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 17/06/04(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

Anonymous 17/07/27(Thu)10:57 No. 16530 ID: a10255

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Earth Hole Anonymous 17/01/05(Thu)16:26 No. 16406 ID: 4318e8 [Reply]

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Hello /sci/. If there was a giant hole in the earth leading from one end to the other and- if you jumped in- would you just be pulled to the other side, or just be trapped in the middle by gravity?
>Pic unrelated

2 posts omitted. Click Reply to view.
Anonymous 17/01/15(Sun)07:00 No. 16410 ID: 4c82ad

Gravity is actually the force of all bodies in the universe pulling on all other bodies in the universe. However, the strength of the pull weakens with the square of the distance between two given bodies. Since the celestial bodies in the universe are so far apart, you can say for conveniences sake that you are only under the effect of the gravity of the nearest one (the earth).; in reality though, you are even (very, very weakly) being pulled towards other people, which means that the "your momma" joke about her having a gravitational pull is technically true.

Anonymous 17/01/22(Sun)03:50 No. 16427 ID: ed8b6e

You would lose energy and slowly oscillate and then come to a stop at the center.

Anonymous 17/07/18(Tue)15:21 No. 16528 ID: 9eed6d

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You would bounce a view times around the center just like in that star wars spoof scene- like a jojo or what that crap is called...

bank account getting drained from hackers Anonymous 17/07/17(Mon)01:09 No. 16526 ID: 030037 [Reply]

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Theoretically, how fucked up would I be if someone used a keylogger on my machine for a few month and leaked my bank account details (online password, PIN, security questions etc) on the Darkweb?

Not worried at all but I just wonder how good these computer hackers are at clearing accounts. Aren't there limits depending on the level of your account? They definitely can get around I.P alerts when accounts are accessed in different countries.

Anonymous 17/07/17(Mon)22:25 No. 16527 ID: 33427e

How fucked? Well, completely.

But to do any of that they would have to get administrative access on your system, and if they get that kind of control they could just zombify your computer and get a constant revenue stream from you.

Breaking into a computer to get information on a single credit card is not very efficient. Getting into a bigger system to steal information on hundreds of credits cards, now that's more interesting.

Still, if you were to do the following you could be reasonably protected:
1. Put a hardware firewall between your computer and the Internet. Block all incoming and outgoing connections. Disable UPnP.
2. Put an HTTP proxy on the inside the firewall. The firewall should allow the proxy to connect to things outside, but not to open ports.
3. The proxy should block all domains except those of your bank.
4. Your browser should talk to the proxy to connect to the bank.
5. The computer should never leave the network nor should the network ever be reconfigured. (Corollary: that computer can never be used for anything other than connecting to the bank.)
If you do this, in order to get your keystrokes an adversary would have to take control of both your computer and either the firewall, the proxy, or the bank.

SSID ideas BillyJoeThePianoMan!!HjBTVkMQpk 15/09/29(Tue)00:57 No. 16202 ID: 8aea60 [Reply]

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/sci/ give me some "edgy" SSID ideas, I can have up to four or five on my WRT54Gv5 with DD-WRT. I also figured out I can up the power to about 1.6 watts, but cannot get the -o command to turn on "override" where you can set basically any Tx power. Also I can use channel 12 13 and 14 freely :)

Other than SSID ideas that are "edgy" can you think of any illegal (in the US in general or wherever) SSIDs? Just for lulz.

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Anonymous 17/01/27(Fri)22:12 No. 16442 ID: 94abdf

Dont use channels so close to each other (eg 12, 13, 14), you will suffer the wifi gods wrath.

Anonymous 17/07/05(Wed)02:37 No. 16522 ID: 526026

"allahu akbar" along with some future date.

Anonymous 17/07/07(Fri)19:58 No. 16523 ID: ef3e94

>>Other than SSID ideas that are "edgy" can you think of any illegal (in the US in general or wherever) SSIDs? Just for lulz.

Amateur; Create a captive portal, fill the login page with images of hardcore scat or something equally disturbing, name the SSID something inconspicuous like "The Bensons family wifi" and leave it running unprotected. Anyone who connects in an attempt to leach your internet will be met with a wall of scat the moment they open their browser.

For dbl-lulz name the wifi "Starbucks free wifi" and leave it running within range of one of their coffee shops, fireworks will fly!

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