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Let read this :
<br />
1=1<br />
a=a<br />
a²=a²<br />
a²-a²=a²-a²<br />
a(a-a)=(a+a)(a-a)<br />
a=a+a<br />
a(1)=a(1+1)<br />
1=1+1<br />
1=2<br />
Where is the error ?
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Quote: a(a-a)=(a+a)(a-a)
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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 I don't think, this is a simple factorization
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That you do not think so it will not change the fact that, when you move from this line to the next, you actually divide by zero - (a-a)!!!
More! A solution of an equation must be traversal to both direction - yours is not!
a=a
a²=a²
This is a one-way step and is forbidden...
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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The error is in your lack of understanding what this Forum is for and so posting an utterly inappropriate message.
«OOP to me means only messaging, local retention and protection and hiding of state-process, and extreme late-binding of all things. » Alan Kay's clarification on what he meant by the term "Object" in "Object-Oriented Programming."
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What's inappropriate in the message?
Wrong is evil and must be defeated. - Jeff Ello
(√-sh*t) 2
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Well, all the swear words for starters!
Can't you see them? It may be your local government filtering the internet for you...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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That's ok, I have a lot of little voices adding them back for me.
Wrong is evil and must be defeated. - Jeff Ello
(√-sh*t) 2
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I know what you mean.
Whenever I hear politicians talking, swear words appear in my head too...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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In the case of politicians it's usually together with dark, dark thoughts of actions involving cactii and drills.
Wrong is evil and must be defeated. - Jeff Ello
(√-sh*t) 2
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Cacti? I can see where you are going, but they are a bit soft and squidgy.
Have you considered a barbedwire zipline?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Cactii - plural. 
Wrong is evil and must be defeated. - Jeff Ello
(√-sh*t) 2
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A little grouchy today, perhaps? 
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A little unlike your usual self - woke up from the wrong side of the bed today?
Sure, it's decades old, but hardly inappropriate given the other drivel that goes on here.
Cheers,
विक्रम
"We have already been through this, I am not going to repeat myself." - fat_boy, in a global warming thread 
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The eleventh commandment: Thou shall not divide with zero.
Wrong is evil and must be defeated. - Jeff Ello
(√-sh*t) 2
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There is no error!
1 is indeed equal to 2 for very large value of 1!
I think this is what just happened to you!  
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0 = false
1 or 2 or >2 = true
1=true
2=true
...
??
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Here:
a(a-a)=(a+a)(a-a)
a=a+a Division by zero in the intermediate step.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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He stole it from me while I was typing!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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The actual (mathematical) problem is that an equation solution must be traversal(?) to both direction - this is not!
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 ?
OK, I give up, where did you leave it?
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I bet he hasn't looked behind the fridge; it's the last place anyone ever looks.
Which (by definition) is where you always find what you are looking for, if you are going to.
So...you should always start looking behind the fridge, and then give up.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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