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Archived threads in /sci/ - Science & Math - 518. page

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Math is just the study of arbitrary bullshit. Prove me wrong.
38 posts and 5 images submitted.
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>>8921351
Would math fall under psychology?
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>>8921351
Go to a restaurant (in U.S) and pay the check. What and how do you tip?
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>>8921359
Nothing. It's a retarded practice. Should I also tip taxi drivers?

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What is epigenetics, exactly? From the wikipedia article it seems like it's quasi-heritable traits that arise from different generations being exposed to the same environmental factors, or some shit, but I'm not well versed in biology and know very little about genetics so I'm probably not getting it.
34 posts and 4 images submitted.
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Is it encoded in the junk dna?
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>>8920460
>modification of the genome that leaves the original genetic material intact but that alters expression of this via methylation of base pairs and modification of histone proteins.

This is the simple version
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>>8920487
This, only thing to add is they result in heritable phenotypes

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Define truth in mathematics.

Define truth in logic.
24 posts and 3 images submitted.
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>>8918918
truth=t^2*r*u*h
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>>8918918
A true statement is a statement that is not false
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truth is an empty concept

provability is the best we can do

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What causes me to experience such a big response from Modafinil, /sci/?


>Be me
>Super lazy and task avoidant
>Apathic most of the time
>Take Modafinil 100mg
>1 hour later I am on another world in terms of focus, capacity to visualize, plan and work. I genuinely feel like someone completely different.
>I do more work in 5 hours than what I've done in the last 2 months
>Constantly realizing tings I didn't quite get before
What's wrong with my baseline state that a drug would change me up so much?
25 posts and 7 images submitted.
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lots of dopamine

Modafinil itself doesn't bind to dopamine receptors, but for some reason it causes a pretty large uptick in "natural" dopamine production.
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How did you get Modafinil?
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Rounds like me and ADHD meds. Dunno how tolerance is with modafinil, but you might have realized what I did, that a magic pill in fact can make a lot of problems go away

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Trying to figure this out
11 posts and 2 images submitted.
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>>8922428
related
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>>8922428
>>8922430
I was just about to make the same thred.
Don't fail us /sci/ like /tv/ and /fit/ did
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>>8922428
If the car center of mass is at the middle, then the torque its about half the weight force. It would be like lifting 690kg

12 posts and 2 images submitted.
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>>8922089
It was good, but not because of me. Thank you, coauthors.
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Terrible. David Ritz Finkelstein, who was a major a cunt before he died recently, invited my to his home to explain my theory to him. I told him I got rejected from arXiv and he guaranteed that he I woudl get real peer-review at IJMPD. I submitted my paper there and who was the dumbass fucking reviewer who told me that I didn't know my ass from a hole in the ADM mass-energy? David Ritz Finkelstein. He just put on his anonymous reviewer mask to be a little bitch that wouldn't be to my face, and then I when totally wrecked his (the anonymous reviewer's) criticism by pointing out that the quadrupole moment in the CMB data negates ADM's absolute adherence to non-orientable manifolds only, I got no response and then I couldn't even log into the status of the review IJMPD.

Fuck all the journals. Fuck all the people who think they are more important that the research they showcase be cause no one produces great research anymore and it's just a cum gargling contest about who gets what impact factor since obviously no one is making any significant contributions to anything.

Then later he told my mother that I was "what physicists hate most: someone who writes about physics as if they know physics but doesn't"

Then later everyone else said, "He doesn't write as if he knows physics, his papers are unintelligible"
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>>8922531
man if I were you I'd just suck and swallow like a good little whore

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If matter and energy cannot be created or destroyed, then the Universe has never not existed, right?
13 posts and 1 images submitted.
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>>8922076
Nah, all physical laws are only known to be valid within this universe.
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>>8922076
>right?
no, because matter and energy can be moved
for all we know, the matter/energy that is in this universe popped out of another universe in the multiverse
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>>8922098
What's the unmoved mover?

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>reading textbook
>definition is stated
>says "if" instead of "iff"
19 posts and 4 images submitted.
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>>8921902
Maybe it's not a biconditional. What's the definition?
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"we say X if Y" in a definition means iff
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>>8921904
it's 21 pages long

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we discuss how to create a human empire. we'll assume a lot about technology and time frames but let's keep it realistic.
i think first we should start with mining asteroids and setting up an outpost on the moon. establish a professional fleet similar to a navy, with astronauts trained as soldier a little and similarly to air force pilots. also they should do tours of no more than 6 months in space to maintain the off world bases and establish human presence.

now why would we want military style space exploration and sending people in space which is inefficient ? because militaristic ideals help give people a purpose and because that's kinda the point of exploring space, that we eventually get out there.
22 posts and 4 images submitted.
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>>8921864
Nigga 90% of Astronauts, Cosmonauts, Taikonauts and Pooinloonauts are Air Force pilots, what the fuck are you doing?
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>>8921870
i'm saying take absolute beginners and train briefly like an air force pilot, an army man and a nasa special snowflake engineer
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>>8921864
This is really more of a >>>/tg/ thing.

>rural England, 1900
>rainy Sunday night
>a boy is wandering the streets carrying a severed hand
>he goes to a house and rings the doorbell
>out comes an old man, sees the limb and says
>"Justice has been served"
>the boy walks to 2 more houses, where two old men also react the same

This is all I can say. If you want to know more, you can ask me, but I can only reply with "yes" or "no". If I can't answer the question with those two words or I don't know the answer, I will remain silent. If someone pretends to be me, I'll just move on to another board.
14 posts and 2 images submitted.
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Is it a hand of a known local criminal?
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>>8921839
yes
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>>8921794
can you pack your shit and fuck off, like right now?

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>there are brainlets on /sci/ who think [math]C[/math] in [math]\int f(x) \mathrm{d}x = F(x) +C[/math] is a constant
27 posts and 4 images submitted.
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penis
>>
>there are brainlets on /sci/ who would write [math] \int f(x)\mathrm{d}x [/math] instead of [math] \int f(x)\, \mathrm{d}x [/math].
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>>8921599
but is is a constant

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Correct me if i Am wrong
8 posts and 1 images submitted.
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According to the Bible, you are wrong
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>>8921400
>>8921410
>>8921417
>>8921565
Stop bumping yourself faggot. And learn to fucking use [math]\TeX[/math].
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>>8921400
* Division by a variableneeds a case distinction.
* You might also be removing a solution when dividing by a variable.

Are x,y elements of the Real Numbers.
Is a integer or a real number or a complex number solution desired?

Are we even operating on Real Numbers (and associated operations and comparison rules?)

24 posts and 2 images submitted.
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nice tits
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>>8921020
Not really difficult if you're working with a team of motivated researchers. Its actually fairly common to atleast have one or two publications in Nature or Science if you're planning to have an academic career.

But to be first author you generally need to have some groundbreaking research that is your own or you can just do what most Professors do and let your grad students do all the work for you while you just take credit as the first author.
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>>8921036
Yes it can be kinda easy of you you are a bright person working on a 'sexy' subject. But if your colleagues find out that you're on that track, they might get jealous and will start sabotaging you, and evading that actually is the hard part.

If plasma is contained by a magnetic field, could solid matter pass through?
E.g., the lightsaber
15 posts and 1 images submitted.
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>>8920843
lightsabers are fucking stupid
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>>8920861
YOU GO TO HELL
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>>8920864
Well they are.
>>8920843
Yes.

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WE QUANTUM NOW

I just created a quantum secure cryptographic signature program. I call it the "Sterling Signature".

It's inspired by Lamport signatures, but with smaller keys, and I estimate it would take a quantum computer 1 billion years to break it. (also this is a one-time signature)

Here is how it works: Your private key is a list of 256 random numbers.

To get your public key you hash every random number and put it in a list, then you hash the entire list.

Now to sign a message, first you take the hash of the message. Every 1 or 0 of this has corresponds to one of your private random numbers. If it is a 1, you take the hash of the corresponding private. If it is a 0, you keep the number as it is. You make a list of numbers, some of them hashed and some not. This long-ass list is your signature.

To verify a signature, you need the MessageHash, the public key, and of course the signature. Take the SHA256 hash of the message you want to check, that is the MessageHash. The verify function applies the appropriate hashes and compares the value with your public key. If the values are the same, the signature is verified.

Here is the code:

https://pastebin.com/DgxccNih

The commands are easy:

genKeys()
>generates a public and private key for you.
sign(messageHash, PrivateKey)
>input everything as a string
verify(publicKey, messageHash, signature)
>easy, no?

With that being said, here is my public key:

0d5485c6fa55bbf397dec3bf90eb2da75007b748865a918b0407636935591e5f
16 posts and 2 images submitted.
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We were doing post quantum cryptography in Paris/ to get away from your parents

Message hash: fb12da2cf3fdc4e63ce96941595637a2a4c9f542d2dbd391ca3b72f4231a4f73

Signature:

https://pastebin.com/1uixYQMV
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Gathering pieces and learning more cur cit stuff for a micropython/C device project with the esp32
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>>8920537

What you've described is a shittier version of the following:

https://en.wikipedia.org/wiki/Merkle_signature_scheme

We're basically good on hash-based post-quantum signatures; the above gives us a fail-safe. Why not think about something more interesting like post-quantum PKC based on different flavors of mathematical assumptions? As a starting point, you could look at constructions from RLWE or elliptic curve isogeny.

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