Message in #banned-users · Kappa⁴ Archive

JustinTrudeau May 7, 2016 9:11 PM banned-users

Rex Bot May 7, 2016 9:12 PM banned-users

so what are differential equations and why do they use y anyway?

legorhin May 7, 2016 9:13 PM banned-users

its when there are multiple levels of differentials in one equation

Rex Bot May 7, 2016 9:13 PM banned-users

do I learn this in calc?

legorhin May 7, 2016 9:14 PM banned-users

calc 4

Rex Bot May 7, 2016 9:14 PM banned-users

so not ap calc

legorhin May 7, 2016 9:14 PM banned-users

deffinitely not

Rex Bot May 7, 2016 9:14 PM banned-users

well I guess he was a coleg professor

legorhin May 7, 2016 9:15 PM banned-users

d²y/dt² + dy/dt + y = x

legorhin May 7, 2016 9:15 PM banned-users

solve for y

Rex Bot May 7, 2016 9:15 PM banned-users

derivitives...

Rex Bot May 7, 2016 9:15 PM banned-users

I dont understand them

legorhin May 7, 2016 9:15 PM banned-users

differentials

Rex Bot May 7, 2016 9:15 PM banned-users

are the dy/dt not derivatives?

legorhin May 7, 2016 9:15 PM banned-users

yeah

legorhin May 7, 2016 9:16 PM banned-users

nvm

Rex Bot May 7, 2016 9:16 PM banned-users

y = -d²y/dt² - dy/dt + x

Rex Bot May 7, 2016 9:16 PM banned-users

do I win?

legorhin May 7, 2016 9:17 PM banned-users

differentials are dt, dy, dx...

legorhin May 7, 2016 9:17 PM banned-users

and no

Rex Bot May 7, 2016 9:17 PM banned-users

hold on

Rex Bot May 7, 2016 9:18 PM banned-users

I think I could do something here...

legorhin May 7, 2016 9:18 PM banned-users

y(x) = c1 e^(-x/2) sin((sqrt(3) x)/2)+c2 e^(-x/2) cos((sqrt(3) x)/2)+x-1

legorhin May 7, 2016 9:19 PM banned-users

i used the internet because I can't be bothered to look up how to solve these

Rex Bot May 7, 2016 9:20 PM banned-users

this is as far as I got: y = d (-dy -y +xt^2)

legorhin May 7, 2016 9:21 PM banned-users

thats not valid in any way

Rex Bot May 7, 2016 9:21 PM banned-users

I probably broke some rule somewhere

legorhin May 7, 2016 9:21 PM banned-users

and there was no t in the original

legorhin May 7, 2016 9:21 PM banned-users

nvm

legorhin May 7, 2016 9:21 PM banned-users

whoops

Rex Bot May 7, 2016 9:21 PM banned-users

d²y/dt² + dy/dt + y = x

legorhin May 7, 2016 9:21 PM banned-users

y''+y'+y=x

legorhin May 7, 2016 9:21 PM banned-users

thats better

Rex Bot May 7, 2016 9:22 PM banned-users

solve for y?

legorhin May 7, 2016 9:22 PM banned-users

its the same thing

Rex Bot May 7, 2016 9:22 PM banned-users

y = x - y'' - y'

Rex Bot May 7, 2016 9:22 PM banned-users

Kappa

legorhin May 7, 2016 9:22 PM banned-users

again I'm wrong

JustinTrudeau May 7, 2016 9:22 PM banned-users

legorhin May 7, 2016 9:22 PM banned-users

adding t makes that too complicated

legorhin May 7, 2016 9:22 PM banned-users

not what i meant

legorhin May 7, 2016 9:23 PM banned-users

y''+4y'+4y = x

is alot easier

Rex Bot May 7, 2016 9:24 PM banned-users

why is there a random floating apostrophe?

Rex Bot May 7, 2016 9:24 PM banned-users

or is that like a double prime or something?

legorhin May 7, 2016 9:24 PM banned-users

yeah

Rex Bot May 7, 2016 9:25 PM banned-users

y = (x - y'' - 4y')/4

Rex Bot May 7, 2016 9:25 PM banned-users

Kappa

JustinTrudeau May 7, 2016 9:25 PM banned-users

Rex Bot May 7, 2016 9:25 PM banned-users

how does this even work

legorhin May 7, 2016 9:25 PM banned-users

i forget

legorhin May 7, 2016 9:28 PM banned-users

first you put all the y differentials on one side and solve that for zero

Rex Bot May 7, 2016 9:28 PM banned-users

what about the x?

legorhin May 7, 2016 9:28 PM banned-users

more work

legorhin May 7, 2016 9:32 PM banned-users

it involves itegrals and some stuff you need to memorize

Rex Bot May 7, 2016 9:32 PM banned-users

integral proteins?....

Rex Bot May 7, 2016 9:32 PM banned-users

Keepo

JustinTrudeau May 7, 2016 9:32 PM banned-users

Rex Bot May 7, 2016 9:32 PM banned-users

differential equations:

lipid-bilayer.png 371.2 KiB · captured_local

Rex Bot May 7, 2016 9:32 PM banned-users

Kappa

JustinTrudeau May 7, 2016 9:32 PM banned-users

legorhin May 7, 2016 9:33 PM banned-users

the quadratic formula is actually used to solve for zero

Rex Bot May 7, 2016 9:33 PM banned-users

(-b +/- rad(b^2 -4ac))/2a

Rex Bot May 7, 2016 9:33 PM banned-users

that?

legorhin May 7, 2016 9:34 PM banned-users

yup

Rex Bot May 7, 2016 9:34 PM banned-users

neat

legorhin May 7, 2016 9:34 PM banned-users

only you use the order of differentiation instead of the exponent

legorhin May 7, 2016 9:35 PM banned-users

so

y''+2y'+2y=0

reduces to

1,1

legorhin May 7, 2016 9:39 PM banned-users

then because magic you get

y(t)=c1e^(t)+c2te^(t)

Rex Bot May 7, 2016 9:39 PM banned-users

KALEC WAS RIGHT

Rex Bot May 7, 2016 9:39 PM banned-users

MAGIC IS MATH

legorhin May 7, 2016 9:41 PM banned-users

and my solution is apparently wrong

legorhin May 7, 2016 9:41 PM banned-users

whatever

Rex Bot May 7, 2016 9:42 PM banned-users

0/10

legorhin May 7, 2016 9:42 PM banned-users

its been a year since i've done math

Rex Bot May 7, 2016 9:42 PM banned-users

you should have your monacle revoked sir

legorhin May 7, 2016 9:42 PM banned-users

I have to do it next year in Linear Systems II

legorhin May 7, 2016 9:43 PM banned-users

signal processing is easy thankfully

legorhin May 7, 2016 9:45 PM banned-users

http://www.shurtugal.com/2016/05/07/catch-up-on-christophers-answers-from-his-recent-reddit-ask-me-anything-part-one/

Catch up on Christopher's answers from his recent Reddit "Ask Me...

In the first of our three-part Reddit AMA recap, Christopher discusses the status of an Eragon movie reboot, plus a very different ending for Eragon/Arya), the gender of his upcoming scifi novel&#8…

www.shurtugal.com

legorhin May 7, 2016 9:45 PM banned-users

if you haven't read inheritance you should

Rex Bot May 7, 2016 9:46 PM banned-users

never got to read eragon

Rex Bot May 7, 2016 9:46 PM banned-users

was going to for my senior thesis but then someone took it before me