Author Topic: Something you know  (Read 19847 times)

0 Members and 4 Guests are viewing this topic.

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
Re: Something you know
« Reply #15 on: February 24, 2011, 05:35:10 pm »
http://en.wikipedia.org/wiki/Euler's_formula#Proofs

You'll need to know some calculus (as a warning).




Offline broooom

  • LV2 Member (Next: 40)
  • **
  • Posts: 28
  • Rating: +2/-0
    • View Profile
Re: Something you know
« Reply #16 on: February 24, 2011, 05:35:35 pm »
- Oops, wrong mathemathics used :P -
« Last Edit: February 24, 2011, 05:38:06 pm by broooom »

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
Re: Something you know
« Reply #17 on: February 24, 2011, 05:36:25 pm »
That'd mean:

e^ip + 1 = 0
e^i * e^p = -1
e^i = -1/e^p
i = ln(-e^-p)
i = -p * ln(-e)
That can't be right! :o

It could be; remember ln(x) is undefined when x is negative.




Offline squidgetx

  • Food.
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1881
  • Rating: +503/-17
  • rawr.
    • View Profile
Re: Something you know
« Reply #18 on: February 24, 2011, 05:37:24 pm »
e^(pi i) does not equal e^(pi)*e^(i)

@ruler501, check this link: http://en.wikipedia.org/wiki/Euler's_formula#Proofs It's a bit hard to understand without a backing in calculus though :P

Generally you can't really conceptualize raising a number to an imaginary power; the main method of going about this sort of thing is creating a power series (a polynomial) that mimicks the behavior of e^x. e^x's power series (which, when taken to an infinite amount of terms is perfectly accurate) then can be used with imaginary values for x and still make sense.
e^x's power series looks like this:

and so e^(ix)'s power series looks like this:

You'll have to take my word for it that that series is actually cosx+i*sinx. The rest of the proof goes from there.
« Last Edit: February 24, 2011, 05:42:58 pm by squidgetx »

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
Re: Something you know
« Reply #19 on: February 24, 2011, 05:38:50 pm »
e^(pi i) does not equal e^(pi)*e^(i)

Didn't see that.

@ruler501, check this link: http://en.wikipedia.org/wiki/Euler's_formula#Proofs It's a bit hard to understand without a backing in calculus though :P

Ninja'd ;)

With almost the exact words :D
« Last Edit: February 24, 2011, 05:39:47 pm by Deep Thought »




Offline apcalc

  • The Game
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1393
  • Rating: +120/-2
  • VGhlIEdhbWUh (Base 64 :))
    • View Profile
Re: Something you know
« Reply #20 on: February 24, 2011, 05:42:10 pm »
Ah yes!  That has to be the most beautiful mathematical statement that exists! :)

Although I still sometimes refuse to believe in its beauty, this still eludes me more! :)


Offline squidgetx

  • Food.
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1881
  • Rating: +503/-17
  • rawr.
    • View Profile
Re: Something you know
« Reply #21 on: February 24, 2011, 05:43:56 pm »
How about 1+2+3+4+....=-1/12 :D

Or 1+2^2+3^2+4^2+.....=0 O.o

Also @Deep, yeah I saw but I figured he didn't :P So I reposted it.
« Last Edit: February 24, 2011, 05:45:29 pm by squidgetx »

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
Re: Something you know
« Reply #22 on: February 24, 2011, 05:44:39 pm »
Although I still sometimes refuse to believe in its beauty, this still eludes me more! :)

Whoa, what? O.O

And slightly off-topic: the Wikipedia URL is awesome too ;D

How about 1+2+3+4+....=-1/12 :D

Or 1+2^2+3^2+4^2+.....=0 O.o

:crazy: Where'd you get that?
« Last Edit: February 24, 2011, 05:45:08 pm by Deep Thought »




Offline squidgetx

  • Food.
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1881
  • Rating: +503/-17
  • rawr.
    • View Profile
Re: Something you know
« Reply #23 on: February 24, 2011, 05:50:05 pm »
Wiki
Also, 1+1+1+1...=-1/2

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
Re: Something you know
« Reply #24 on: February 24, 2011, 06:00:44 pm »
EDIT: Fixed the quote
Think about how you would do something like raising something to an imaginary power :D You can set up ratios and stuff and do more stuff and stuff. Also, e^(ix)=cos(x)+isin(x), so 3^i would be cos(ln(3))+isin(ln(3))

EDIT: so you can say with that the idea that e^(i2pi)-1=0 (that is i times 2 times pi)
So how would you calculate n^i with any real number for n
and then from that how would you calculate i^(ni)
None of these things work on my calculator so I'm wondering
@squidgetx I know that that factors into the two polynomial approximations for the trigonometric functions.

Does anyone one know anything that will help me learn more about/grasp imaginary numbers and things like raising things to imaginary powers?
« Last Edit: February 24, 2011, 06:05:54 pm by ruler501 »
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
Re: Something you know
« Reply #25 on: February 24, 2011, 06:03:38 pm »
I was hoping to find/write a program that would do this but I see that that would be very hard to do

EDIT: I was asking about how Zeda got 3^i would be cos(ln(3))+isin(ln(3))
« Last Edit: February 24, 2011, 06:07:04 pm by ruler501 »
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline squidgetx

  • Food.
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1881
  • Rating: +503/-17
  • rawr.
    • View Profile
Re: Something you know
« Reply #26 on: February 24, 2011, 06:04:15 pm »
Sorry I deleted my post, as it didn't make much sense. Yeah, i'm not quite sure how you would do it :P

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
Re: Something you know
« Reply #27 on: February 24, 2011, 06:07:23 pm »
i edited my post above with what my question was
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
Re: Something you know
« Reply #28 on: February 24, 2011, 06:07:44 pm »
Wiki
Also, 1+1+1+1...=-1/2

Math makes no sense. That's why I love it :D




Offline Juju

  • Incredibly sexy mare
  • Coder Of Tomorrow
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 5730
  • Rating: +500/-19
  • Weird programmer
    • View Profile
    • juju2143's shed
Re: Something you know
« Reply #29 on: February 24, 2011, 06:12:02 pm »
O_o how the hell adding an infinite number of positive numbers equals a negative one?

Math sure is weird.

Remember the day the walrus started to fly...

I finally cleared my sig after 4 years you're happy now?
THEGAME
This signature is ridiculously large you've been warned.

The cute mare that used to be in my avatar is Yuki Kagayaki, you can follow her on Facebook and Tumblr.