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**polylog****Member**- Registered: 2006-09-28
- Posts: 162

I just wanted to say hello to everyone on this great forum.

I've been reading a lot of the old posts looking for interesting problems and enjoying them all.

I hope to learn a lot and also contribute whenever possible. Thank you for your time

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**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

Hello polylog and welcome!

I'm sure you'll be able to learn something here

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,630

Hi polylog, and welcome to the forum. Glad to have you "on board"

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**justlookingforthemoment****Moderator**- Registered: 2005-05-26
- Posts: 2,161

Hello. Thanks for joining us!

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**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,730

Hi polylog,

A big welcome to the forum

And what a beautiful username you've chosen,

so mathematical!

Yet, as a piece of information, polylog is undefined,

thats because if you repeatedly take the logarithm of a number,

at some stage you reach either zero or a negative number.

Thereafter, logarithm of that number is undefined or meaningless

Anyways, it was a lovely thought to chose this username.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**espeon****Real Member**- Registered: 2006-02-05
- Posts: 2,586

hi polylog also ganesh whats a logarithm?

Presenting the Prinny dance.

Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Erm...Espeon, you'll learn about that when you're older. If we explained it to you, you probably wouldn't understand. But don't worry, your school will teach you soon.

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**polylog****Member**- Registered: 2006-09-28
- Posts: 162

Thanks to everyone for the nice welcome.

ganesh wrote:

Hi polylog,

Yet, as a piece of information, polylog is undefined,

thats because if you repeatedly take the logarithm of a number,

at some stage you reach either zero or a negative number.

Thereafter, logarithm of that number is undefined or meaningless

Anyways, it was a lovely thought to chose this username.

Actually I can't take any credit for coming up with the name... I just remembered it from an article about "integrals that can and cannot be done" from Wolfram Research, and the Polylogarithm function (PolyLog[n, z]) was one of the special functions that comes up with along with other integrals that have no elementary antiderivatives, like the functions erf(x), the log integral Li(x), and so on.

Here is a good definition: http://mathworld.wolfram.com/Polylogarithm.html

espeon wrote:

hi polylog also ganesh whats a logarithm?

hi espeon, here is a simple introduction to the idea:

Consider multiplying 10 *by itself* twice: 10 x 10 = 100.

Or 3 times: 10 x 10 x 10 = 1000.

Or 4 times: 10 x 10 x 10 x 10 = 10000

Now, try to answer these questions:

"How many times do we multiply 10 by itself to get 100?"

"How many times do we multiply 10 by itself to get 1000?"

"How many times do we multiply 10 by itself to get 100000?"

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**espeon****Real Member**- Registered: 2006-02-05
- Posts: 2,586

1.10^2

2.10^3

3.10^5

and also if im going to learn soon i want to show off its funshowing off and if u havent noticed im much smarter than other 12 year olds well actually im 12 and 11 days

Presenting the Prinny dance.

Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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**polylog****Member**- Registered: 2006-09-28
- Posts: 162

espeon wrote:

1.10^2

2.10^3

3.10^5

Right!

You have just calculated some logarithms.

The logarithm is the number of times the number called the *base* has to be multiplied by itself to get a certain number as a result. Or in other words, what power of the base gives a certain number. The base in this case was 10.

the notation is like this ('log' is short for logarithm):

10^2 = 100, so we say log(100) = 2.

10^3 = 1000, so we say log(1000) = 3.

10^5 = 100000, so we say log(10000) = 5.

Try the "log" button on your calculator for numbers like 100000, 10000000, etc.

espeon wrote:

if u havent noticed im much smarter than other 12 year olds

I would say so!

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**espeon****Real Member**- Registered: 2006-02-05
- Posts: 2,586

oooooooooooooooooooo i get it now! thanks

Presenting the Prinny dance.

Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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**polylog****Member**- Registered: 2006-09-28
- Posts: 162

Glad to help!

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**espeon****Real Member**- Registered: 2006-02-05
- Posts: 2,586

lol ty. also funny joke rod just so you dont get left out

Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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**soha****Real Member**- Registered: 2006-07-07
- Posts: 2,530

welcome

"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"

- David O. McKay

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**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Polylog hasn't been sighted anywhere *recently*. I wonder what happened to him? Maybe he's just busy.

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**soha****Real Member**- Registered: 2006-07-07
- Posts: 2,530

welcome poly log

"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"

- David O. McKay

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**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

His last post was the 30th of November...

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**Toast****Real Member**- Registered: 2006-10-08
- Posts: 1,321

Welcome polylog!

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**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

espeon wrote:

oooooooooooooooooooo i get it now! thanks

But remember that there's a lot more to it than that.

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