WKB (Wentzel-Kramers-Brillouin-Jeffreys 1923-1926)

Layer 1 — Physicsin the perturbation-theory subtree

G Wentzel-H Kramers-L Brillouin 1926 + Jeffreys 1923 WKB; modern modern foundational text + connection-formula + 2024 quasinormal-modes BH.

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