Course information was given, emphasis on this webpage. 
Overview of the course. 
Examples of signals and systems. 
Definition of signal (function of one variable), continuous-time (real-valued variable), discrete-time (integer-valued variable). 
Review of complex numbers, particularly Euler's identity exp(jt) = cos t + j sin t. 
Definition of signal energy and power (examples), time shifting, reversal, and scaling.
Even and odd signals; signal is a sum of its even and odd parts.