Multiple solutions for nonlinear Neumann problems driven by a nonhomogeneous differential operator

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Coercive and noncoercive nonlinear Neumann problems with indefinite potential (2016, background): “The second deformation theorem (see, e.g., Gasinski and Papageorgiou [15, p. 628]) implies that the above definition of critical groups of ÿ at infinity is independent of the particular choice of the level c inf ÿ(Kÿ).”