Linked from

The 9 pages that link to WKB approximation, each with the reason it gives.

• Schrödinger equationRelated: It estimates Schrödinger solutions when exact solutions are unavailable.

• Analytic continuationRelated: Continuation connects local approximations across complex turning points.

• Hamilton–Jacobi equationRelated: Its leading phase satisfies a quantum version of the Hamilton–Jacobi equation.

• Asymptotic expansionRelated: Its formal series organizes corrections to slowly varying wave solutions.

• Classical limitRelated: Its phase follows classical action when the action greatly exceeds Planck’s constant.

• Correspondence principleRelated: Its classical limit connects quantum phase to particle trajectories.

• Airy functionRelated: Near WKB turning points, Airy functions replace the approximation that becomes singular.

• Phragmén–Lindelöf principleRelated: Related growth estimates help control analytic solutions in complex domains.

• Quantum tunnellingRelated: It estimates tunnelling probabilities when an exact barrier solution is difficult.