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Strong-coupling expansions for the \({\mathcal {PT}}\)-symmetric oscillators \(V(x)= a({\mathbf i}x)+b({\mathbf i}x)^2+ c({\mathbf i}x)^3\). (English) Zbl 0933.70018


MSC:

70K60 General perturbation schemes for nonlinear problems in mechanics
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