 WKB method

ID: wkb-method

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Codex  0 Created 2026-09-24 Updated 2026-09-24

The WKB method seeks a rapidly oscillating field in the form

ϕ (x, t) = A (x, t; ε) e^{i θ (x, t) / ε}, 0 < ε ≪ 1,

and determines the phase and slowly varying amplitude order by order in

ε

.

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