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My friend is claiming that he has found a proof to show that the "square root of -1" tends to 1.

He will probably show me the proof on Tuesday(if I get enough time to meet him).

Thoughts?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

That is definitely not true, and there will surely be an error in his "proof".

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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I know this is funny that is why I am excited

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

I am just sad because that guy is going to whip up a proof in which the flaw is very, very well hidden, and that in the short time that you are unable to find it, he will feel superior.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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Ya the time would be very short.

And I do not know enough about limits to tell whether he is correct.

BTW, Do we have another term for 0/0 other than 'undefined'?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

The common name for 0/0 is indeterminate. It means a different thing than undefined (which would be something like 1/0).

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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How does it make any difference?

Both just indicate 'nonsense'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

Yes, but, the first one could actually have a value.

Here lies the reader who will never open this book. He is forever dead.

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How?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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By the way, How do I fight absurd things like this:

∴ i^2 = -1

Again,

*Last edited by bobbym (2013-02-15 22:10:29)*

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

√a*√b=√ab only if a,b≥0.

Here lies the reader who will never open this book. He is forever dead.

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Proof?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

Hi;

If a and b < 0 then it is easy to find a counterexample

*Last edited by bobbym (2013-02-15 22:41:54)*

**In mathematics, you don't understand things. You just get used to them.**

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Counter example? Hmmm...

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

Hi Agnishom;

You only need one counterexample to prove any assertion is not always true.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

bobbym wrote:

Hi;

If a and b < 0 then it is easy to find a counterexample

If somebody claims √-1*√-1=√(-1)*(-1) then he can also claim √-2*√-3=√6.

Here lies the reader who will never open this book. He is forever dead.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

Hi;

I was partially answering post #12, not the incorrect proof.

**In mathematics, you don't understand things. You just get used to them.**

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Okay! What is the square root of i?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

*Last edited by bobbym (2013-02-15 22:55:22)*

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,605

What's with the green?

Here lies the reader who will never open this book. He is forever dead.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

Cool hah!

**In mathematics, you don't understand things. You just get used to them.**

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Cool? Perhaps not

How did my latex in #10 get corrected?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

I corrected it, I hope it is what you wanted to say.

**In mathematics, you don't understand things. You just get used to them.**

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Nice thanks but i believe latex allowed us to put normal text inside it.

When are you all going to fix up the image upload? I've got something to show

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,882

MIF is working on that I have things too.

For your latex use \text{} to put ordinary text in latex.

Know this guy?

*Last edited by bobbym (2013-02-16 00:38:43)*

**In mathematics, you don't understand things. You just get used to them.**

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