2=1

[threefingeredguy]

In response to Ti-Ho's signature:
~_
.9 = n
~_
9.9 = 10n
~
9 = 9n
~
1 = n
~_
.9=1 (Amazing, eh?)

I have this:
a=b
a^2 = ab
a^2 + a^2 = a^2 + ab
2 a^2 = a^2 + ab
2 a^2 - 2 ab = a^2 + ab - 2 ab
2 a^2 - 2 ab = a^2 - ab
2 (a^2 - a b ) = 1 (a^2 - a b )
1=2
Thank you and good night.

[chipmaster]

This is why you shouldn't divide by zero. Still very interesting.
Spoiler below:

Starting from 2 (a^2 - a b ) = 1 (a^2 - a b ),
because a^2 = ab, a^2-ab = 0 so:

2(0) = 1(0) which is true, but his step would be to divide both sides by a^2 - ab which is zero

(2(0))/0 = (1(0))/0 Err: Divide by zero

With the same logic, 5 = 100:

x = y
x-y = 0
5(x-y) = 100(x-y)
5 = 100

[c_plus_plus]

[elfprince13]

I remember working through the 2=1 thing a long time ago, back in elementary school with the greatest teacher I ever had.....

[Brazucs]

[DigiTan]

My linear algebra prof showed us a proof that i and j were two different numbers. I forgot how exactly and now I can't find it on google. But basically, it amounted to j = -i. And he's not the only who's agreed with this.

[elfprince13]

the physics teacher at our school doesn't believe in gravity.

[thornahawk]

DigiTan, yes, i and j are two different things. Google on "quaternions". :)

elfprince13, did s/he say why not?

thornahawk

[elfprince13]

he says that if you drop something off the edge of a cliff (no wind...) it will fall parallel to the cliff even though the cliff won't be pointed to the center of the earth. I think that is bs since the cliff's are so minuscule compared to the earth that it is falling to the center of the earth but the difference in direction is so tiny you can't tell.

[trigkid213]

I saw that proof freshman year, along with this one:

Statement // Reason
Girls = (Time)(Money) // Ask any guy with a girlfriend.
Time = Money // The old saying, "Time is money."
Girls = (Money)(Money) // Substitute "Money" for "Time"
Girls = (Money)² // Duh.
Money = √Evil // The old saying, "Money is the root of all evil."
(Money)² = Evil // Square both sides.
Girls = Evil // Substitute "Evil" for "(Money)²"

:biggrin: :biggrin: :biggrin:

[CDI]

I figured out the 2=1 thing back in 6th grade ^^ got me an A for the quarter

[Arcane Wizard]

[WikiGuru]

I'm amazed how my signiture has cause such a stir among the united-ti forum (this happened at school, too :biggrin: )

[DarkerLine]

Then there's -1. Which is equal to 1.


√(-1) = √(-1)

√(-1/1) = √(1/-1)

√(-1)/√(1) = √(1)/√(-1)

√(-1)√(-1) = √(1)√(1)

-1 = 1

[Weregoose]

I can provide the fallacy there with one symbol: ±

This is one of my favorites, just because it's so much more colorful.

[JoeImp]

First one to prove .9999... = 1 wins.

[IAmACalculator]

Pun intended, of course.

89s don't like the following, for some strange reason:

[Rezek]

[DarkerLine]

[JoeImp]

.999 repeating

[EDIT] - Err I guess I didn't really read this thread too well. I guess first one to ACTUALLY prove it, without using some divide by 0 trick.

[EDIT 2] - And this: