Hopefully we can get some collaboration/clarification on the homeworks.

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Q: On homework 1, question #9, it says "Show that the signal cos(10*pi*t) impersonates *it* as far as sample values are concerned." Does 'it' refer to the original signal [x(t)], or does it refer to the sampled signal [x_s(t)]?

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

Dr. Paul Garrett