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Abbott and Costello said it better.
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PIEBALDconsult wrote: Abbott and Costello, who were on first, said it better.
It was missing something.
I wanna be a eunuchs developer! Pass me a bread knife!
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tayoufabrice wrote: Where is the error ?
In stupidity?
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Usually the error is between the chair and the monitor.
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What, the desk?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Close, about an inch away from it. It is usually thick though.
EDIT: I should have put the joke symbol on the first post.
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Nah, she didn't day "damn", she said "f......". 
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The error begins from first assumptions -- saying 1=1 at the beginning is meaningless; everthing following can provide no additional insight.
a²-a² and a-a are always zero, but this is due to the nonsense above that -- in particular, while a²-a²=a²-a² may be true, it doesn't follow from a²=a².
The idiot of a Discrete Math teacher I had in college tried showing this to the class once. 
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 As I know mathematics doesn't approve 0=0
so, the error is a²-a²=a²-a² (meaning 0=0)
exactly it is a teacher who showed it to us.
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It has nothing to do with 0 equal to 0 or not (which is a mathematical game only), but the fact that division by zero is not permitted (or more precisely the outcome is undefined)...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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Yes, but the damage is done before that.
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You mean, when OP went to learn math?
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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1=1
a=a <=> a/a=1
a²=a² ??
a=b <=> a/b=1
a²=b² ??
then
a=b
a-c = b-c ?
a-a = a-a (assuming a=b and a=c) ??
Where is the division by zero ? I've added c at both sides of =
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At the final step, you effectively have a=0, which means that a/a=1 on the second line is division by zero.
But why were b and c introduced? It's just nonsense.
Additionally, a²=b² certainly does not mean a=b.
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a=0 never means a/a=0 (a can never be 0).
a=a <=> a/a=a/a <=> 1=1
I could fix the post as :
Given a C ]--;0[ U ]0;++[ (meaning 0 excluded)
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Which means that you have an equation system and not a single equation...It's a different thing to solve...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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tayoufabrice wrote: Where is the error ?
In between your ears: obviously the answer is 42.
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the answer is 42
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a - a = 0
You cannot get anything useful from a multiplication once it has involved a zero term.
5 x 0 = 12012 x 0
does not mean that
5 = 12012
There are two kinds of people in the world: those who can extrapolate from incomplete data.
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very very TRUE
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The error is simultaneously in line 5, your misunderstanding of basic maths, and your posting of this question.
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The error is I haven't had coffee yet.
New version: WinHeist Version 2.1.0
There's a fine line between crazy and free spirited and it's usually a prescription.
I'm currently unsupervised, I know it freaks me out too but the possibilities are endless.
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