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/sci/ - Science and Mathematics

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ad8832 No.34[Reply]

Rewrote this to be slightly less shit.

Anyway, welcome to not-halfchan-/sci/, home of actually intelligent and decent discussion. Of course, anarchy tends to prevent this, so we will have to have rules.

1: Religion vs science arguments are prohibited. Take that shit over to >>>/rel/, please. Or, better yet, don't fucking do it.

2: If you're here to ask for help on homework, go to >>>/hwk/.

3: Sources for all facts, okay?

4: Keep topics related to science and mathematics, please. It's the name of the board for a reason.

More can be added if necessary. Again, don't make it necessary.

Post last edited at

File: b901a089a6f9f8a⋯.png (90.5 KB, 645x729, 215:243, brainlet.png)

dfa643 No.4963[Reply]

I have n number of marbles and n ≤ 100. If I group the marbles into some groups of three, I will have

2 marbles left that belong to no group. If I group the marbles into groups of five, I have no marbles

left. But when I group them into groups of seven, I will have 4 marbles left. How many marbles that I

actually have? In other words, determine the value of n

0a5b6b No.4964

File: 27c234f33702754⋯.jpeg (122.19 KB, 1024x852, 256:213, 27c234f337027541f5a0c18cd….jpeg)


ac848f No.4965

Really though, it is not that hard. It's a mod question. You are looking for an n in which n=0(mod5), n=2(mod3), and n=4(mod7). I have it solved if anyone wants the answer.

812c16 No.4968

You basicallly get a set of equations/inequalities:

n <= 100

n = 3x + 2

n = 5y

n = 7z + 4

where each of n, x, y, z are natural numbers.

This small C program bruteforces the problem:

#include <stdio.h>
int main(void)
int i;
for (i = 1; i <= 20; ++i)
if (((5*i - 2) % 3) == 0)
if (((5*i - 4) % 7) == 0)
printf("Solution is %d\n", 5*i);
return 5*i;

812c16 No.4969

File: 44a9fb234d6b3c7⋯.gif (12.77 KB, 296x226, 148:113, 1-s2.0-S0960077901002429-g….gif)

Btw nice brainlet manifold, OP. Now make a horned sphere one.

a198e1 No.4978

You mental midgets aren't familiar with the Chinese remainder theorem, are you?

File: 3fe3aa08db1e890⋯.png (149.87 KB, 250x204, 125:102,  .png)

ceafd3 No.4967[Reply]

1) absolutely universal and universally absolute

2) specific to our universe

3) specific to how our brains work

4) specific to how our minds have developed to work

5) an illusion

Which one is it?

c7e081 No.4972


none of them

also all of them

ceafd3 No.4976


Your answer is neither true nor false.

1c389b No.4977

how can one even prove any of these statements as true

File: f054bae1e8eb2cb⋯.png (128.91 KB, 446x324, 223:162, nanalan.png)

3440ec No.4945[Reply]

I'm writing a scifi book, details aren't important but i want a method of travel that is both flashy and plausible. So if you could give me some quasi-science I'd give you an internet or whatever you kids want now a days

e97d6f No.4962

big fucking catapult

5babfa No.4974


>giant catapult, it's actually not a bad idea

>safer than space cannon

cf7eb5 No.4975

File: c2aa4a1856a1d02⋯.gif (1.93 MB, 300x170, 30:17, 1522922038175 (1).gif)


Ever read Chuck Pahalinuck's (or however you spell the guy who wrote Fight Club's name) Rant?

Its got time travel using the shock of an impact to 'force' someone randomly through time, using, of all things, car crashes to provide said force.

Flashy, involving horrible accidents and death, time travel…the big thing being that the time travel is spontaneous, making it so that you have no direction in time your traveling, no way to really prove/record it besides your word…

File: 785832019a04073⋯.png (3.33 KB, 308x162, 154:81, xy.png)

a6a281 No.4966[Reply]

Can I get an equation for this?

c30dfe No.4971


looks like arcsin(sin(x)) and arcsin(cos(x)) to me

b3c0dc No.4973


It's called Trianglesin(x)

Why would you want an equation for this graph? Nothing in the world resembles Trianglesin(x) so it is a useless signal to know.

File: 35aae36ce40e89e⋯.png (171.53 KB, 2518x1024, 1259:512, Dark Matter.png)

55f42a No.4903[Reply]


56167e No.4906

Isn't dark matter a random name to name something we don't even know what it is? Is dark matter the remaining mass of the universe when we remove what we know?

Isn't dark matter actually the plain exemple of how we don't understand shit?

4d20eb No.4907


ive never understood how they can say there are big clouds of dark matter in the universe then say that there is a picture.

fcffad No.4908

File: ae18972ac01aea8⋯.jpg (505.85 KB, 1080x839, 1080:839, illusions-pics-3.jpg)


Hello and Salutations.

Introductions are in Order.





More To Follow.

Good Bye.


00100011 01010100 01111001 01101100 01100101 01110010 00001101 00001010 01001000 01100101 01101100 01101100 01101111 00100000 01100001 01101110 01100100 00100000 01010011 01100001 01101100 01110101 01110100 01100001 01110100 01101001 01101111 01101110 01110011 00101110 00001101 00001010 01001001 01101110 01110100 01110010 01101111 01100100 01110101 01100011 01110100 01101001 01101111 01101110 01110011 00100000 01100001 01110010 01100101 00100000 01101001 01101110 00100000 01001111 01110010 01100100 01100101 01110010 00101110 00001101 00001010 01001001 01101110 01110110 01100101 01110011 01110100 01101001 01100111 01100001 01110100 01100101 00101110 00001101 00001010 01010010 01100101 01110011 01101111 01101100 01110110 01100101 00101110 00001101 00001010 01001100 01100101 01100001 01110010 01101110 00101110 00001101 00001010 01010100 01100101 01100001 01100011 01101000 00101110 00001101 00001010 01001101 01101111 01110010 01100101 00100000 01010100 01101111 00100000 01000110 01101111 01101100 01101100 01101111 01110111 00101110 00001101 00001010 01000111 01101111 01101111 01100100 00100000 01000010 01111001 01100101 00101110 00001101 00001010 01010100 01010010 01001001 01010011 00001101 00001010

e9b370 No.4947


There's a picture of gravitational lensing taking place in a way that shouldn't be happening if you don't account for dark matter

That is, there's a gravitational lens but it's not visible. In other words, there's dark matter there


>Isn't dark matter actually the plain exemple of how we don't understand shit?

It is

0f4148 No.4961


>your theories apparently are way off because others lead you to the conclusion that the universe's mass must be at least an order of magnitude larger than what you thought it was

>"hurr let's stick to what whatever we had and just label that surprising apparent unknown >90% of mass "dark matter" lmao"

File: 511cf980324298f⋯.png (1.03 MB, 666x1024, 333:512, plane.png)

bc5394 No.4960[Reply]


File: 1457790261566.png (5.26 KB, 555x508, 555:508, 34801412922058955.png)

4d00d5 No.3862[Reply]

There is a german saying: »Alle guten Dinge sind drei.«

I present you Quantum Logic.


2 posts and 1 image reply omitted. Click reply to view.

f7bd92 No.4580


But what makes this any more "quantum" than binary?

ddb294 No.4602

File: a8ec5fdcbe767ea⋯.jpg (575.09 KB, 962x920, 481:460, tumblr_m17em8qhs51rojv9po1….jpg)


Misleading name. Doesn't actually have anything to do with quantum mechanics.

9bd9e8 No.4610


Wat kind of Sudoku is this?

9bd9e8 No.4611


yeah, it's just base 3 operations.

b77fba No.4959


Ternary logic (with values TRUE, FALSE, NULL) resolves many if not most paradoxes (for instance the value of the proposition "this sentence is false" would be NULL and not "paradoxical/invalid because it can't be TRUE nor FALSE).

File: 6d044ad9dbfc1d6⋯.jpg (71.15 KB, 554x551, 554:551, Advice Dog 17012017230528.jpg)

6ec501 No.4371[Reply]

There are no absolutes in the universe as far as we know.

When you invent 0 you also invent infinity and since the two cancel each other out

It's like me arguing that if you don't reply your mom dies tonight and then you pull your immunity cat trap card

So where are the provided absolutes?

12 posts and 7 image replies omitted. Click reply to view.

2b9a9d No.4909

logic and motion are both absolute.

415a05 No.4955

Absolutes in terms of what exaclty? Discussing anything without a well-defined context (whether implied or stated explicitly) is pointless.

415a05 No.4956


>what is absolute zero.

Isn't that just an arbitrary threshold (somewhat similar to the threshold of hearing = 0 dBA) where we say anything below it isn't meaningful so we disregard it? Planck's length also isn't the "absolute quantum of length" many believe it to be, but it's just a length below of which length isn't meaningful in within the structure of currently accepted physical theories.

415a05 No.4957


The world "coldness" is misleading because it's a placeholder for "heat level below a certain threshold of reference". When you feel "cold" it means ambient temperature level at your precise location is lower than what you consider comfortable (and thus subconciously use as your personal level of reference, calling temeperatures above it "warm" and below it "cold").

415a05 No.4958


>"logick is absolute"

>nevermind there's literally at least dozens of different logick systems

>nevermind the ulitmately failed torturous attempt of formalizing everything based on "muh absolute logick" that was "Principia Mathematica"

>nevermind Goedel's finding that a logick sytem can't be both complete and non-contradicting

>"motion is absolute"

>nevermind it's always relative to the chosen frame of reference (the only exception being zero-rest-mass entities moving with the speed of light)

File: 2e7740367b58f38⋯.png (3.72 KB, 200x133, 200:133, 200px-Infinite.svg.png)

436e0f No.4618[Reply]

>Cantor's diagonal argument

>Gödel's incompleteness theorem

>Zeno's paradox

>Galileo's paradox

>Ross–Littlewood problem

The list goes on and on. The so called "solutions" to these problems are hideous abortions tacked onto real math and logic. Most of modern math is only usable in a tiny subset of the problems it can be applied to. Finite length statements/equations that need to be decidable in a finite amount of time, e.g. all formal systems, cannot be expected to properly deal with infinites.

Thanks for reading, I know most of you are too indoctrinated to agree.

19 posts and 1 image reply omitted. Click reply to view.

000000 No.4877


It looks like you're just using the normal differentiation rules, except in a convoluted way with slightly non-standard notation. What is supposed to be different about this method?

Also what exactly is the definition of Δ? In your first post you use it to mean subtraction of successive integers, but now you are using it to mean differential.

477ac1 No.4882


Δ Delta, both times used to indicate change.

c0ec93 No.4952


If all you have in naturals then your geometry must be quantized too. That means that a perfect circle can't exist in your geometry, only approximations thereof which can be represented in your quantized geometry. All approximations of Pi in such a system are going to be rational numbers.

c0ec93 No.4953


Planck's length is a physical concept, not a mathematical one. A real number line is dense and there's an infinite number of reals in any part of it, no matter how small. Infinity is engrained in the real numbers and manifests in any subset of them.

c0ec93 No.4954


>pi = 4

If you approximate a circle with a square which the actual circle is inscribed in, sure.

File: 8d8e7244e4f7a89⋯.jpg (29.68 KB, 512x384, 4:3, WhatHasScienceDone.jpg)

737531 No.4718[Reply]

>human life is worthless, not special in the slightest

>nobody has free will, we are all slaves to causality

>there is no paradise after death, only a void of inescapable non-existence

>everything is random, chaotic, unpredictable

>because of entropy, as time passes, everything only goes from worse to worst

>for most of its existence, the Universe will be a cold, dark and lifeless void

>sooner or later black holes will forever erase all existing information - our lives, our memories, our hopes and dreams -

>time travel is impossible and multiverses are unreachable, there is no way to escape any of this

The most secular and unbiased analysis of the fundamental principles of this Universe leads to the inevitable conclusion we are living in some kind of Hell.

Pic related.

2 posts omitted. Click reply to view.

fee816 No.4740


We can appreciate life anyway, even if "worthless" or irrelevant.

Also, i still believe there is some kind of escape door for us to travel, or dimension hop, to another universe when the current one is at it's limit in terms of entropy and disorder.

It will happen many thousands of years from now, so there's that.

fee816 No.4742


We can appreciate life anyway, even if "worthless" or irrelevant.

Also, i still believe there is some kind of escape door for us to travel, or dimension hop, to another universe when the current one is at it's limit in terms of entropy and disorder.

It will happen many thousands of years from now, so there's that..

b42906 No.4797


it beats not existing

5ea21d No.4937

>human life is worthless, not special in the slightest

Relative. Its worth more than anything we've found out there so far.

>nobody has free will, we are all slaves to causality

Also relative. Free will generally describes the ability to adapt given our circumstances and how we choose to do so. Whether or not this is an illusion is more of a philosophical argument than a scientific one.

>there is no paradise after death, only a void of inescapable non-existence

Impossible to prove or disprove, which is why it isn't scientifically relevant.

>everything is random, chaotic, unpredictable

Then why do we find patterns in so much?

>because of entropy, as time passes, everything only goes from worse to worst


>for most of its existence, the Universe will be a cold, dark and lifeless void

We do not have the reach or technology to state with certainty about much of the Universe. Science can take us far but we are still in Plato's cave.

>sooner or later black holes will forever erase all existing information - our lives, our memories, our hopes and dreams -

Your life span is a greater threat than black holes in this regard.

>time travel is impossible and multiverses are unreachable, there is no way to escape any of this

it is also impossible to accurately predict future technology at the hands of unforeseen future scientific breakthroughs

20e443 No.4951


That's (undefined). Non-existence cannot be experienced. Similarly, the question "why is there something rather then nothing" cannot be asked if there were nothing, hence being able to ask it implies there must be something.

File: c5d2d6f194c7fa1⋯.png (58.81 KB, 677x630, 677:630, Ethnographic_Iberia_200_BC….png)

File: a65dd5648cee4c6⋯.png (298.07 KB, 924x762, 154:127, Iberia_300BC-en.svg.png)

File: fb0cf6e2b220fc8⋯.png (10.42 KB, 481x393, 481:393, Aquitani.png)

File: 7d0e22be8b05b02⋯.png (540.99 KB, 483x3700, 483:3700, 1450737671364.png)

4e1d16 No.4787[Reply]

>no ling thread

>no map pronz

if you have juicy maps pls spoiler. this is a sfw board desu :^)

1 post and 4 image replies omitted. Click reply to view.

4e1d16 No.4789

File: 66b5e7c580a9c8f⋯.jpg (356.79 KB, 2046x1353, 62:41, afghanistan-ethno-linguist….jpg)

File: d11a3ddd7fabcdb⋯.jpg (1.25 MB, 2574x2054, 99:79, afghanistan-ethno-linguist….jpg)

File: 55951e34d73ff9a⋯.png (19.72 KB, 320x351, 320:351, download (3).png)

File: 32856a3a93d08ec⋯.png (548.51 KB, 640x508, 160:127, download (1).png)

File: 068d1329d638ad3⋯.gif (94.33 KB, 632x374, 316:187, download (1).gif)

im putting in general neolithic/archaelogy whatever stuff too because i like that sort of shit

4e1d16 No.4790

File: 50b68e5043e54c5⋯.png (108.2 KB, 595x842, 595:842, 595px-Etnie_Nuragiche-2.sv….png)

File: eab119f84d71078⋯.jpeg (32.82 KB, 356x239, 356:239, download.jpeg)

File: 96414c375976ab2⋯.jpg (29.69 KB, 400x219, 400:219, Indo-european_-_languages_….jpg)

dont have much else. someone else should start posting

abandon thread bye

8f4f53 No.4802

File: 98f40a1cc1a99e7⋯.png (791.15 KB, 2067x2312, 2067:2312, Germanic_dialects_ca._AD_1.png)

8f4f53 No.4803

File: f3730c74463a91c⋯.png (492 KB, 2065x1548, 2065:1548, Linguistic_map_of_the_Ural….png)

File: 6df14858cd09b8b⋯.png (943.99 KB, 2560x1511, 2560:1511, Uralic_languages_in_the_Ru….png)

File: 8adeb4468edf797⋯.jpg (4.98 MB, 2446x2819, 2446:2819, Africa_ethnic_groups_1996.jpg)

b3ee6f No.4950




Is that nigger serious?

File: e6b37e619fdf2a8⋯.png (20.39 KB, 525x368, 525:368, Charles Murray Book.png)

a40dc1 No.4825[Reply]

And some groups like Niggers and Arabs have never done that?

3 posts omitted. Click reply to view.

671e2f No.4840


Tell us where all the Muslim Noble Prize winners are. And how come Muslims failed to industrialize or invent actual science.

b8d522 No.4841


The yardstick is western oriented.

Had this measured metaphysics advancement India would be a heavy hitter.

212653 No.4843


This. It's not hard to say I'm the best human in the world if you simply define me as the best human.

671e2f No.4845


> metaphysics advancement

Sure Pajeet.


Hey leftypol.

64c2ae No.4949


Are you retarded? The leading surgical textbook in the world for 500 years was written by an Arab. Algebra comes from the Arabs, etc. etc. You have a point with niggers though.

File: 2618e793c84a779⋯.jpg (121.42 KB, 1402x684, 701:342, MaleandFemalepelvic.JPG)

File: 515a8724092bf23⋯.jpg (489.86 KB, 835x1080, 167:216, efa421d38938d340e959e41d7f….jpg)

File: eca7da8d49db27a⋯.jpg (34.69 KB, 450x419, 450:419, stock-photo-pelvis-female-….jpg)

f22598 No.4792[Reply]

Apparently, human women are the only mammals that lack a proper full-term pregnancy. When any other mammal (excusing the platypus, I guess?) gives birth, the child is immediately able to walk. Humans however, after birth, still need some months just to be able to sit unsupported, let alone walk. Walking would demand another 9 months or so.

My question is: if human women were to have proper pregnancies where the child were to gestate for the length of time needed in order to be able to walk within hours of birth, how wide would a woman's hips need to be?

df059c No.4832


If i fully understand your question i d answer no.

As we are the only bipeds mammals, walking is an automatism that need to be build by practice.

Maybe birds is a counter exemple, idk

0d4c45 No.4896


Birds only have two limbs/legs though, discounting their wings

f7bbb7 No.4948


Newborns can't even walk on all fours though. They literally can only cry when they need to be catered to.

File: 9880a7a3da121d5⋯.jpg (6.63 KB, 180x279, 20:31, download (1).jpg)

d43b83 No.4946[Reply]

Have you read "The Concept of Model: An Introduction to the Materialist Epistemology of Mathematics" by Alain Badiou /sci/?

Why not? It may actually help you.

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