On Wed, May 6, 2015 at 12:35 PM, Ron Roscoe <[log in to unmask]> wrote:

> Oi!  Phase, polarity...........
> Polarity is just a special instance of phase shift; 180 degrees!
This is incorrect.

Consider an asymmetrical waveform, say square on the positive half, but
triangular on the negative. Phase shifting it one half cycle (180 degrees)
and adding it to the original waveform will NOT cancel it out.

Only inverting the polarity will cause it to cancel.

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