Negative Frequency Waves? Or: What I talk about when I talk about propagation

P. Kinsler, 

    Blackett Laboratory,
    Imperial College London,
    Prince Consort Road,
    London SW7 AZ,
    United Kingdom.

    http://arxiv.org/abs/1408.0128


The existence of waves with negative frequency is a surprising and 
perhaps controversial claim which has recently been revisted in optics 
and for water waves. Here I explain a context within which to 
understand the meaning of the "negative frequency" conception, and why 
it appears in some cases.  

Email: Dr.Paul.Kinsler@physics.org