# Fourier Series - Convergence

## Homework Statement

Please see attached image. From the given information, I am having trouble deriving the left and right hand limits, I just can't figure out what these are...

http://img176.imageshack.us/img176/9334/fstih3.png [Broken]

None needed.

## The Attempt at a Solution

In the solution, t is chosen as pi, which I understand. But I just can't figure out how these left and right hand limits are found. Are these limits somehow derived from limits of integration?

Here is the solution.

http://img176.imageshack.us/img176/2899/fst2yg0.png [Broken]

Any help will be appreciated.

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Dick