Nonlinear Potential Theory of Degenerate Elliptic Equations the text goes on to

the text goes on to consider linear equations — including discussions of complex-valued solutions

Odd John and Sirius are something else besides explorations of superbeings

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Nonlinear Potential Theory of Degenerate Elliptic Equations the text goes on toA self contained treatment appropriate for advanced undergraduates and graduate students, this text offers a detailed development of the necessary background for its survey of the nonlinear potential theory of superharmonic functions. Starting with the theory of weighted Sobolev spaces, this treatment advances to the theory of weighted variational capacity. Succeeding chapters investigate solutions and supersolutions of equations, with emphasis on