Fourier mode
= Fourier mode
A spatial Fourier mode has the form $e^{ikx}$ and is an eigenfunction of every constant-coefficient spatial differential operator; in particular, $\partial_x^2e^{ikx}=-k^2e^{ikx}$.
= Fourier mode
A spatial Fourier mode has the form $e^{ikx}$ and is an eigenfunction of every constant-coefficient spatial differential operator; in particular, $\partial_x^2e^{ikx}=-k^2e^{ikx}$.