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I will prove 1=0 ; spot the fallacy

 
Jesus Angeles
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Let X = Y

Subtract both sides by Y

X-Y = Y-Y

Divide both sides by X-Y

X-Y Y-Y
--- = ---
X-Y X-Y

Simplify the equation
Left side is 1 since numerator and denomenator are the same.
Right side is 0 because the numerator is Y-Y which is 0.

Therefore,

1 = 0
 
David O'Meara
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Android Eclipse IDE Ubuntu
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Divide by zero After that, everything else is invalid.
We had an interesting 'discussion' on the effects of dividing by zero a while back, but I won't go looking for a link since it mostly revolved around one person saying computers should check for divide by zero errors, and the rest of us saying they should
 
Stan James
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My dad used to prove 1==2 with some trick like that, but he filled the blackboards all the way around his classroom to do it.
 
Jesus Angeles
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it was my father too who showed this to me.

i wont be surprised if i show this to my future children; at least to those interested in math.
 
Chetan Parekh
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5=6
 
Don't get me started about those stupid light bulbs.
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