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I have proof that 2=1
Maple story Forums : Chat : Talk about topics not related to MS
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Thread starter
Nov 02 2009 +
lilaznmage15
LilAzn718
65 Scania Night Walker
 
Alright, so my math teacher was looking up riddles and puzzles when he stumbled onto this one: 2=1
At first I didn't believe him till he wrote and all down, it actually make sense if you take it step by step.
• a = b Suppose a=1 and b=1
• a+a = a+b Add 'a' to both sides
• 2a = a+b a+a=2a (1+1=2*a)
• 2a-2b = a+b-2b Subtract 2b from both sides
• 2(a-b) = a+b-2b 2a-2b = 2(a-b)
• 2(a-b) = a-b b-2b = -b (1-2=-1)
• 2 = 1 Divide both sides by a-b

Now this statement is FALSE, I would have you post your comments about why YOU think it's wrong but you have the internet as a tool so what's the use?
I will save you the time from looking it up and tell you why it's wrong.
Notice the very last step: Divide both sides by a-b
This is impossible when a and b are converted into numbers: Divide both sides by 1-1
You should know already that it is impossible to divide any number by 0.
Since this is algebra it is correct and incorrect at the same time, just depends on your point of view I guess...
Click here if you think this post is particularly interesting or helpful.
Poll - I have proof that 2=1
6%
10 votes   This is cool!
28%
42 votes   Lame
47%
70 votes   I knew the answer! (Because I'm smart, I cheated, I saw this already, etc etc.)
17%
25 votes   I'm confused...
Replies
11/02/09 +
femaleaznsin
HeaLmonk
142 Khaini Bishop
 
a=b
a=1
b=1
1=1.

QFT now shush, this is the PROPER answer.
profil3
security
11/02/09 +
DarkWater
Priestified
35 Bera Cleric
 
jamflan: If you don't understand imaginary numbers don't comment...


I already posted why that "proof" was wrong. For any two numbers x and y, sqrt(xy) = sqrt(x)sqrt(y) is only true is x and y are positive real numbers. -1 is not positive, thus making that statement false.
11/02/09 +
GreyBlobb
 
DarkWater: I already posted why that "proof" was wrong. For any two numbers x and y, sqrt(xy) = sqrt(x)sqrt(y) is only true is x and y are positive real numbers. -1 is not positive, thus making that statement false.


You care a bit too much
profil3
security
11/02/09 +
DarkWater
Priestified
35 Bera Cleric
 
GreyBlobb: You care a bit too much


I was just explaining why that proof was wrong. He knew it was wrong because it was proving that 2=0. It's one of those invalid proofs like the one in the OP...he was testing out Basil's math prowess. xD I was just answering. Chill. =P
online
11/02/09 +
Beca
PandaYoshi
43 Scania Fighter
 
Why would you have two different variables represent the same number? And if you plugged it in, assuming that you already knew the values of the variables, they'd be equal. Interesting, it actually turns math upside down.
profil3
security
11/02/09 +
DarkWater
Priestified
35 Bera Cleric
 
Beca: Why would you have two different variables represent the same number? And if you plugged it in, assuming that you already knew the values of the variables, they'd be equal. Interesting, it actually turns math upside down.


Huh? That proof in the OP is mathematically correct except for the 2nd to last step. Everything else is perfectly legal... o_o
11/02/09 +
Kehaar
Achkt
37 Yellonde Gunslinger
 
Check your order of operations in the second to last step there, bud.
11/02/09 +
GreyBlobb
 
DarkWater: I was just explaining why that proof was wrong. He knew it was wrong because it was proving that 2=0. It's one of those invalid proofs like the one in the OP...he was testing out Basil's math prowess. xD I was just answering. Chill. =P


3 posts per page on every math related thread isn't just answering a question anymore
online
11/02/09 +
Beca
PandaYoshi
43 Scania Fighter
 
DarkWater: Huh? That proof in the OP is mathematically correct except for the 2nd to last step. Everything else is perfectly legal... o_o


Don't ask me. I'm not a math wiz like you o_o
11/02/09 +
david82794
iWalk2Knight
44 Scania Night Walker
 
Chuck Norris can divide by 0

this is pretty old ._.
11/02/09 +
angel37
xLuckyThi3fx
61 Scania Assassin
 
i don feel like doing math right now...
profil3
11/02/09 +
hev3nly
LuckPl0x
37 Scania F/P Wizard
 
This has been been posted at LEAST 5000 times.
online
11/02/09 +
qqtan36
istealusoul
52 Broa Dawn Warrior
 
the second step is stupid. you would NEVER ADD a number to both sides
online
11/02/09 +
Belloman
iisPokeman
85 Bellocan Hermit
 
Lol the "Divide by 0" fallacy...So old.
Nov 03* +
jamflan
JamFlan
62 Bellocan Spearman
 
CrayonScribble: A better proof would be prove: a^3 + b^3 =/= c^3 if a,b,c are intergers.


lol fermats last theorem, that took like 400 years to solve...

@qqtan36 "the second step is stupid. you would NEVER ADD a number to both side"

Have you never solved a quadratic equation?
x^2 - x - 2 = 0
(x - 2)(x + 1) = 0
then take (x - 2) = 0
and add 2 to each side
x = 2
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