Does the GPL requires recognition?

[Aryan Ameri <a.ameri@linuxiran.org>]

Hi there:

A basic licensing question:
Does the GNU GPL, requires authors of derivative works, to give credit 
to the original authors or not? I mean, let's say if I write a GPL 
program, and someone uses a portion of my code in his GPL software, is 
it mandatory for him to give me credit for my work?

Cheers
-- 
/* My name is Jehovah. I have a special plan to save the universe, but
because of heavenly security reasons I can't tell you what that plan
is. Your's just going to put your faith in me, because I see the
picture and you don't. You know I'm good, because I told you so. If you
don't believe me, I'll throw you on my enemies list and throw you in a
pit where Infernal Revenue Service will audit your taxes for eternity*/
						--RMS
Aryan Ameri