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## #1 2012-10-22 15:51:25

Wink
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### Signum function

What will be sgn(a+bi)?

## #2 2012-10-22 16:21:44

bobbym

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### Re: Signum function

Hi Wink;

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.

## #3 2012-10-22 16:56:11

Wink
Guest

### Re: Signum function

Is the csgn(x) function related to sgn(x)?

## #4 2012-10-22 23:08:33

bobbym

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### Re: Signum function

Hi;

The csgn function is defined like this:

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.

## #5 2012-10-23 00:59:38

Wink
Guest

### Re: Signum function

If I want to find sign of complex number what should I use, sgn(z) or csgn(z)

## #6 2012-10-23 02:36:21

bobbym

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### Re: Signum function

Hi;

I would use the sgn(z).

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.

## #7 2012-10-23 02:38:28

Wink
Guest

### Re: Signum function

Then what is csgn for?

## #8 2012-10-23 02:42:33

bobbym

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### Re: Signum function

Hi;

The guys at Waterloo say:

The csgn function is used to determine in which half-plane ("left" or "right") the complex-valued expression or number x lies.

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.