Ok, I came up with the idea to list stupid or funny examples of classifying D.T. systems or C.T. systems. -- Adam Frey

System 1: A discrete signal for the amount of toilet paper and how much is used in a period of time(one day,month,year?) by one person. What we would gain? The knowledge of when, in a typical day, it is used. Also how much the average person uses per day in the John. Would the findings show it is on an every day usage or every other day or more. Who

Who would benefit? : The toilet paper companies!

What is the signal and the system? : The signal would be a weight sensor on the toilet paper measuring how much is taken away, and a set time after it has been unrolled it would record the data and what time it was used.

The system would be the person . x[n] --> [person] ---> y[n]. That is all i have for now so anyone else feel free to add to mine or think of your own obscure signal and system. --Freya 15:01, 23 June 2009 (UTC)

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Abstract algebra continues the conceptual developments of linear algebra, on an even grander scale.

Dr. Paul Garrett