I like the explanation part. But I think the "fixed over time" is not that exact. It is a little bit confusing. What do you mean by behavior and characteristics are fixed over time? Besides that, I really like your definition. --Hetong Li

I think the explanation is pretty clear. It's a direct quote from Oppenheim Wilsky, so it probably should be. Next time you should probably cite your source. The answer is correct. Good work. --Ben Moeller


Collin, you are a god among men. Good job. --Ben Horst

This is a very imprecise definition. It would not get much credit on a test. Please give a mathematical definition instead. --Mboutin 15:19, 19 September 2008 (UTC)

Better luck next time I guess...i agree that behavior and characteristics is kind of vague...

I still love you -- Cory

Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang