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Originally Posted by Denman
a couple of things
Firstly:
i can prove that 1=0
ok, assume its an identity (cant do that on a keyboard but assume the = is an identity sign)
if you say 1=0
if you take 1 from each side
0=-1
multiply by 2
0=-2
add one to both sides
1=-1
Square
1=1
voila 
or do it backwards to get it if you like. |
squaring is not a 1 to 1 operation, thus you cannot do the proof backwards, and thus it is not valid.
x^2 = y^2 --/--> x = y
(x squared = y squared) does not imply (x = y)