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## Main Question or Discussion Point

[itex]r\rightarrow r-2qz[/itex] and [itex]\psi\rightarrow\psi+q\cdot(r-qz)[/itex], 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

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

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