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## Homework Statement

11. What kind of frequency components can be observed in the output if a linear system is excited by a symmetric square wave?

12. What kind of frequency components can be observed in the output if a non-linear system is excited by a symmetric square wave?

## Homework Equations

I have no idea

## The Attempt at a Solution

Well, all I was given to answer this problem was the following wikipedia page about Fourier transforms http://en.wikipedia.org/wiki/Fourier_transform. I still feel that I am not sufficiently informed to answer these questions.

I have a test about this in an hour so I please hope somebody can help me out. Thanks a lot.