Whenever I come to prosoundweb, I always head to the basement first. Threads like this are why.
I had a professor a while back who explained phase to us as "kinda the direction the waveform starts" and thus waveforms have positive and negative phase. He was a networking prof attempting to explain how a modem works. I guess he was a little out of his element. Almost drew him a unit circle on the test, but decided to just play along.
Question: Something I've wondered, why is the null set symbol used? Is there some sort of link, or is just a standard?