Exercises similar to the new homework problems - on whether certain systems
are invertible, time-invariant, ... Ways to establish this.
Evaluation of some geometric series.
Calculation of a convolution.
Properties of convolution - commutative, distributive, associative.
If LTI systems having impulse responses h1 and h2 are in parallel, then
it amounts to a single LTI system with impulse response h1 + h2.
If they are in series, then it amounts to a single LTI system with impulse
response h1 * h2.