# Cylindrical coordinate of Galilean transformation

## Main Question or Discussion Point

$r\rightarrow r-2qz$ and $\psi\rightarrow\psi+q\cdot(r-qz)$, I don't know how to derive it, anybody know?

This question results from the book "Optical Solitons: From Fibers to Photonic Crystals [1 ed.]" section 6.5

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## Answers and Replies

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jedishrfu
Mentor
Does the expression or theorem have a name? Perhaps you can search on it to see what pops up.