-  [WT]  [PS]  [Home] [Manage]

  1.   (new thread)
  2.   Help
  3. (for post and file deletion)
/sci/ - Science, Technology, Engineering, and Mathematics

Join us in IRC!

•This is not /b/ or /halp/. Tech support has its own board.
•If you are not contributing directly to a thread, sage your post.
•Keep the flaming at a minimum.
•Tripcodes⁄Namefags are not only tolerated here, they are encouraged.
•We are here to discuss sci-tech, not pseudoscience. Do not post off-topic.

•♥ Integris

  • Supported file types are: GIF, JPG, PNG, WEBM
  • Maximum file size allowed is 5120 KB.
  • Images greater than 200x200 pixels will be thumbnailed.
  • Currently 749 unique user posts. View catalog

  • Blotter updated: 2018-08-24 Show/Hide Show All

We are in the process of fixing long-standing bugs with the thread reader. This will probably cause more bugs for a short period of time. Buckle up.

Movies & TV 24/7 via Channel7: Web Player, .m3u file. Music via Radio7: Web Player, .m3u file.

WebM is now available sitewide! Please check this thread for more info.

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

File 148991401746.png - (112.72KB , 925x301 , Worldlines.png )

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

10 posts and 1 image omitted. Click Reply to view.
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.

Anonymous 20/11/20(Fri)18:45 No. 17064 ID: 13789f

>Pic unrelated
Why not get into time travel? The good thing is the subject is an iceberg, on the surface it looks like a small subject but the majority is underneath.

Not only will you look autistic but everyone else will feel retarded. Double-win!

Anonymous 21/12/17(Fri)11:16 No. 17962 ID: 7f5b34

Theoretical mathematics is just people jerking off to fictional concepts that they made up on their own;
instead of trying to understand reality, they instead make classifications of abnormal phenomenons and then call it concept A and then just call it a day. Sure, it sounds smart but it's ultimately just retarded.

Physics is less so because there are actual practical elements in said field. But the theoretical mathematics syndrome is slowly creeping into the field so it's becoming another retarded field.

Which is why more people are more into engineering than just pure physics these days. Even though the latter was much more interesting.

certain people from India who fire you because you are not in their caste justice987 21/12/08(Wed)00:43 No. 17950 ID: 602775 [Reply]

File 163892061277.jpg - (28.36KB , 361x425 , death of american engineers.jpg )

Thanks to Harvard we are now allowed to talk about how certain people from India will fire you because you are not in their caste. Look at your company org chart and you will mostly see managers from india only seem to hire other people from india that are in their caste. There are some smart people from India but this racist behavior has to go. tps://www.nbcnews.com/news/asian-america/harvard-adds-caste-bias-protections-graduate-student-workers-rcna7279

Anonymous 21/12/09(Thu)11:05 No. 17953 ID: 1c6e63

>certain people from India will fire you because you are not in their caste
>only seem to hire other people from india that are in their caste
Self-contradiction. It was about dalits.

>There are some smart people from India but this racist behavior has to go.
You can be both smart and a castist.

And here's a working link: https://www.nbcnews.com/news/asian-america/harvard-adds-caste-bias-protections-graduate-student-workers-rcna7279

Math is wack. Americium 21/10/11(Mon)19:07 No. 17837 ID: d2a5e8 [Reply]

File 16339720598.jpg - (29.13KB , 540x960 , 82318465_10206866778304869_8225603218482930759_o.jpg )

Just as Cantor's theorem shows there is no set of all sets, there is also no set containing all truths.

Or to put it another way: it's a truth that all truths can't be collected up into a totality.


2 posts omitted. Click Reply to view.
Americium 21/10/13(Wed)00:01 No. 17842 ID: d2a5e8


No wait, I might have misspoken my second part:

That being said, I still stand by my point that I wouldn't want to work in any set theory without a set of functions between any two sets.

Anonymous 21/11/10(Wed)03:56 No. 17896 ID: 586542

I don't buy this argument
consider a finite set {1,2}
then 1 is in {1} {1,2} and not in {2} {null}
and 2 is in {2} {1,2} and not in {1} {null}
The powersets are generated by the elements of the set.
This is like saying that there is no vector space basis of primes (2,0...)x1+(0,3,...)x2+(0,0,5,...)x3+... = v = (2,3,5,7,...)

Americium!Metal3G/gs 21/11/12(Fri)05:07 No. 17899 ID: d2a5e8

Do go on.

US Nuclear site whitepapers? Anonymous 21/10/17(Sun)16:48 No. 17852 ID: 3f0b94 [Reply]

File 163448212468.png - (959.10KB , 915x552 , vogtle.png )

For information on the design of a US NRC licensed power plant/reactor design, what should I look for? I would like to learn about the engineering of nuclear power facilities beyond some overall "big fucking waterheater" descriptions.

Anonymous 21/10/18(Mon)13:24 No. 17856 ID: 72c0e7

You mean technical schematics, sorry but those are classified.

Now Chernobyl, that's another thing, there's plenty of technical schematics floating around because it's totted as a "what not to do".

Huge numbers. Really huge Anonymous 21/09/19(Sun)09:24 No. 17798 ID: b04a98 [Reply]

File 163203627322.png - (213.73KB , 1100x800 , Pellefant-och-Pip.png )

How many *bits* does it take to correctly represent a 200-million digit number?

13 posts and 1 image omitted. Click Reply to view.
Anonymous 21/10/01(Fri)05:04 No. 17824 ID: 126958

Oops. LOL. No KNOWN primes longer than 83 million bits.

Anonymous 21/10/09(Sat)22:47 No. 17834 ID: d2a5e8

A little off-topic, but if you guys like extremely huge (finite) numbers, check out this youtube playlist:

Anonymous 21/10/10(Sun)18:05 No. 17836 ID: 220f76

Thanks! :-)

MATHS AND PHYSICS HELP Anonymous 20/06/25(Thu)23:01 No. 16936 ID: d51c3d [Reply]

File 159311891663.jpg - (180.62KB , 1356x668 , mafs.jpg )

Hello /sci/, newfag here. I want to selfstudy Math,Statistics,Physics. I've bought bunch of SAT and AP books on those topics. Do you have anything to suggest? Any resource would be appreciated.

Wolfram Alpha DrGonzy!!WvAwV4MTHk 20/06/27(Sat)21:12 No. 16937 ID: fb30bf

I have been told this site is quite useful for math and engineering students.


Anonymous 21/09/15(Wed)11:03 No. 17791 ID: a90f2c

after the understanding of pemdas. the best thing you can do is MEMORIZE identities/ where identities are coins, the coins being equations, and the faces the sides. these dualities can exist in flux while the parts are in place. after you memorize these you must cement them in your mind... for they are the math you seek to understand.

its unpleasant but math is a language of intuition. and probably the hardest to grasp.

Anonymous 20/11/18(Wed)14:49 No. 17053 ID: ef3a67 [Reply]

File 160570739458.jpg - (382.42KB , 843x843 , adoptionstudy.jpg )

Why is the racial intelligence gap so taboo?

You even mention that 70,000 years of evolutionary divergence in separate environments MIGHT have played a role in differing powers of intellect and reason and you're basically blackballed.

20 posts omitted. Click Reply to view.
Anonymous 21/04/21(Wed)21:11 No. 17462 ID: c92f2d

>IQ is used as a measure of intelligence by psychiatrists and clinical psychologists across all ages
Considering it has zero purpose but to classify and label people (you can't improve your IQ), knowing it doesn't help adults do anything. It would be like saying that a person's fingerprints are "used" by psychiatrists and psychologists. They are not, and IQ is not.

Anonymous 21/05/14(Fri)21:01 No. 17540 ID: 4c24c2

It helps inform public policy decisions, and may be used by high IQs to interact with low IQs in such a way that they benefit from the exchange.
It is far easier to push oppressive policies on a segment of the population that literally lacks the capability for coherent thought.

Anonymous 21/06/17(Thu)23:37 No. 17671 ID: 96fcaa

Everyone know the gap exists and that race plays a role, it's just that no one wants to get Watsoned


Blinding laser weapons Anonymous 21/06/03(Thu)23:47 No. 17614 ID: 54a03f [Reply]

File 162275685871.jpg - (249.48KB , 3120x4160 , IMG_20210103_210939.jpg )

I like laser weapons that blind people. Do you?

Anonymous 21/06/04(Fri)05:57 No. 17615 ID: cf9d5b

File 162277905266.png - (65.75KB , 250x250 , 4356.png )

This isn't science, engineering, nor maths.

Anonymous 21/06/07(Mon)02:20 No. 17631 ID: a0cb60

File 16230252245.jpg - (399.53KB , 3120x4160 , IMG_20210315_081534.jpg )

Yes it is

Abiogenesis is a fairy tale for Darwinists Anonymous 21/03/26(Fri)20:48 No. 17384 ID: 7d5109 [Reply] [First 100 posts] [Last 50 posts]

File 161678810583.gif - (1.16MB , 320x180 , 1615157057787.gif )

A major unresolved issue when dealing with the origin of life is that prebiotic syntheses invariably generate very heterogeneous solutions of organic compounds. This makes it impossible to imagine how ordered linear polymers, amino acids and nucleotides could be assembled. Prebiotic chemistry could produce a wealth of biomolecules from nonliving precursors. But the wealth would become overwhelming in the prebiotic soup and one cannot fathom how organized chemical processes could emerge from such a mess. At the heart of this problem is a dreary and vicious circle: what would be the selective force behind the evolution of the extremely complex translation system before there were functional proteins? There could be no proteins without a sufficiently effective translation system. How a random collection of proteins would assemble themselves into some kind of proto-cell capable of primitive replication is not even remotely answered. Modern cells require hundreds of proteins carrying out specific tasks when assembling a new protein molecule and if only a small portion of them were crudely made it is impossible to manufacture a new cell. The cells translational system is highly dependent on accurately made proteins and a faulty translational system is by default a biochemical paradox in evolutionary terms. A primitive cell is faced with an impossible task: in order to develop a more accurate translational system is has to translate more accurately. Each imperfect cycle introduces further errors and the cyclical nature of self-replication in the cell means that imperfections lead to autodestruction. A complex system like a cell cannot be gradually achieved because of its many complex and perfectly coadapted proteins.

713 posts and 74 images omitted. Click Reply to view.
Anonymous 23/02/14(Tue)22:24 No. 18492 ID: 0af699

The dedication of this strawberry is bewildering.

Anonymous 23/04/10(Mon)13:12 No. 18506 ID: 7d5109


Is this the latest schizo babble meaning delusion?

Anonymous 23/04/11(Tue)08:29 No. 18507 ID: adb842

File 168119456591.png - (90.09KB , 796x703 , larping aspie.png )

it's that autist again, lmao

simple identity verification scheme Anonymous 21/05/26(Wed)23:24 No. 17567 ID: 424a5a [Reply]

File 162206427582.jpg - (73.22KB , 720x631 , 5cd8d122da5b12f670c8f07be0639902da5dfb1598d709c992.jpg )

Once, while idly wondering, I came up with a simple scheme to prove the authenticity of a chain of messages given the authenticity of the first.

It consists of putting a hash at the end of each message (but the last, if you know where the chain is going to end) and the input to the previous hash at the beginning (or anywhere really) of each subsequent message.

That's it. It's really simple but I was wondering if it had a name?

SHA256 Hash: d29bde9ef6607caa1f99bd06434449bb972bae43718a7701b2e878bc5fe452a7

3 posts omitted. Click Reply to view.
Anonymous 21/05/29(Sat)03:05 No. 17580 ID: be6f8f

Oh! You mean you include in each message the input to the hash in the previous message. Sorry, I misunderstood. What you're referring to is known as proof of knowledge.

>Also, blockchains have consensus mechanisms such as PoS, FBA and PoW.
A blockchain is merely a data structure where each block is linked to the previous block (or some number of blocks) via a hash. It does not imply a distributed system. Even if there is a distributed system, the consensus algorithm can be as simple as "whatever the authoritative source says", which is pretty much how Git is typically used.

>I said prove authenticity "given the authenticity of the first", not absolutely.
If that's all the assurance you want, you could also include your ECDSA public key in the first message and the signature for each subsequent message. Then you wouldn't need to keep track of which secret message you used as input to the previous hash.
Needless to say, neither method protects you if the site's operator decides to rewrite you messages.

>All in all, it seems like a pretty useless protocol compared to something like RSA or Lamport signatures. Oh well, it might end up being useful as part of something else, or in a different form.
Well, you're just using it wrong, I'd say. Proofs of knowledge are typically used to prove that you had a piece of information at an earlier time that you decide to disclose that information. For example, you might make public a hash predicting that the stock market will crash this week, and after it crashes you make public that information, which should hash into the previous hash.

Anonymous 21/05/29(Sat)18:11 No. 17581 ID: 424a5a

Previous password: "Rose Mary"

I've heard of proofs of knowledge. Though I dont think I've heard of them by that name.

> you could just use ECDSA
How fast is it to generate an ECDSA keypair and sign messages? IIRC RSA is slow compared to this scheme.

Next hash: 5fcb6406566e4cbe34ceb9ee0cc2cf02f729842c369936763b550101ae8c7354

Anonymous 21/05/29(Sat)20:55 No. 17582 ID: 746924

IIRC, almost all naturals less than 2^256 are valid Secp256k1 private keys, so picking a private key is just a matter of getting a few random bits. I think there were exactly two points on the curve that were unusable; one was an inflection point with only a single solution to the equation and the other's tangent was vertical.
Other curves may work differently, although I think all ECDSA curves are more or less the same with only the coefficients changing. As I recall, Curve25519's curve is somewhat different.

Signing a message with ECDSA is faster than RSA, but slower than getting a SHA-256 digest, because the process involves hashing the message. In particular, Secp256k1 uses SHA-256.

Delete post []
Report post