I wish to obtain a solution to two coupled nanonlinear differential equations using perturbative expansion approach. In the expasanions, am interested in the eigenvectors (expansion coeeficients) and eigen values (Simple coeficients of V). In particular, I wish to plot the eigenvalues.

Am familiar with Mathematica and will like to write the algorithms and the plottings in it.

I have attached below a pdf file which describes the problem.

Thank you in advance.

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