# Dictionary:Dispersion equation

A relation between angular wavenumber ${\displaystyle \kappa }$, angular frequency ${\displaystyle \omega }$, and velocity V:
${\displaystyle \kappa ^{2}=\kappa _{x}^{2}+\kappa _{y}^{2}+\kappa _{z}^{2}={\frac {\omega ^{2}}{V^{2}}}}$.