Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

## #1 2013-02-16 19:34:50

Agnishom
Real Member

Online

### MY FRIEND and i

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?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #2 2013-02-16 19:36:46

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

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

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #3 2013-02-16 19:42:02

Agnishom
Real Member

Online

### Re: MY FRIEND and i

I know this is funny that is why I am excited

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #4 2013-02-16 19:48:43

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

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.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #5 2013-02-16 19:53:45

Agnishom
Real Member

Online

### Re: MY FRIEND and i

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'?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #6 2013-02-16 19:58:19

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

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

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #7 2013-02-16 20:00:11

Agnishom
Real Member

Online

### Re: MY FRIEND and i

How does it make any difference?
Both just indicate 'nonsense'

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #8 2013-02-16 20:01:16

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

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

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #9 2013-02-16 20:03:37

Agnishom
Real Member

Online

### Re: MY FRIEND and i

How?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #10 2013-02-16 20:10:25

Agnishom
Real Member

Online

### Re: MY FRIEND and i

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

∴ i^2 = -1
Again,

Last edited by bobbym (2013-02-16 21:10:29)

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #11 2013-02-16 20:41:27

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

√a*√b=√ab only if a,b≥0.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #12 2013-02-16 21:11:17

Agnishom
Real Member

Online

### Re: MY FRIEND and i

Proof?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #13 2013-02-16 21:25:55

bobbym
Administrator

Offline

### Re: MY FRIEND and i

Hi;

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

Last edited by bobbym (2013-02-16 21:41:54)

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #14 2013-02-16 21:36:35

Agnishom
Real Member

Online

### Re: MY FRIEND and i

Counter example? Hmmm...

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #15 2013-02-16 21:40:03

bobbym
Administrator

Offline

### Re: MY FRIEND and i

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.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #16 2013-02-16 21:43:19

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

#### 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.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #17 2013-02-16 21:44:59

bobbym
Administrator

Offline

### Re: MY FRIEND and i

Hi;

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

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #18 2013-02-16 21:49:18

Agnishom
Real Member

Online

### Re: MY FRIEND and i

Okay! What is the square root of i?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #19 2013-02-16 21:54:31

bobbym
Administrator

Offline

### Re: MY FRIEND and i

$\LARGE \inline \bg_green \frac{\sqrt{2}}{2}+\frac{\sqrt{2}}{2}i$

Last edited by bobbym (2013-02-16 21:55:22)

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #20 2013-02-16 22:06:50

anonimnystefy
Real Member

Offline

### Re: MY FRIEND and i

What's with the green?

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #21 2013-02-16 22:07:19

bobbym
Administrator

Offline

### Re: MY FRIEND and i

Cool hah!

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #22 2013-02-16 22:25:44

Agnishom
Real Member

Online

### Re: MY FRIEND and i

Cool? Perhaps not

How did my latex in #10 get corrected?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #23 2013-02-16 22:26:23

bobbym
Administrator

Offline

### Re: MY FRIEND and i

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.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #24 2013-02-16 22:33:06

Agnishom
Real Member

Online

### Re: MY FRIEND and i

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

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'Who are you to judge everything?' -Alokananda

## #25 2013-02-16 22:34:34

bobbym
Administrator

Offline

### Re: MY FRIEND and i

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 23:38:43)

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## Board footer

Powered by FluxBB