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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,918

I didn't see much topics on this subject.

If you know anything interesting about complex or you have a problem with them just post here.

For those who don't know complex numbers are those of the form a+b*i where i is the imaginary unit which is the number for which i^2=-1.

Here are the rules of basic operations with compex numbers:

1)addition:

2)subtraction:

3)multiplication:

4)division:

*Last edited by anonimnystefy (2011-06-03 09:22:42)*

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

The knowledge of some things as a function of age is a delta function.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,918

*Last edited by anonimnystefy (2011-06-05 03:44:12)*

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

The knowledge of some things as a function of age is a delta function.

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

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**123ronnie321****Member**- Registered: 2010-09-28
- Posts: 128

soroban wrote:

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. .

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Complex numbers remind me of elves and dwarves.

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi,

A simple application is to derive multiple-angle formulas:

E,g.

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,918

hi

there are also the n-th roots of unity.The n-th root of unity are those numbers (real or complex) that on the power n gives number 1. For example:

*Last edited by anonimnystefy (2011-06-21 05:01:49)*

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

The knowledge of some things as a function of age is a delta function.

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi anonimnystefy,

Have you read about de Moivre's formula:

http://en.wikipedia.org/wiki/Root_of_unity#Examples

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,918

hi gAr

I read something but not all.

Just noticed that they wrote sqrt(-1) which is incorrect.

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

The knowledge of some things as a function of age is a delta function.

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