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Bifurcation from the essential spectrum. (English) Zbl 0527.35010
Equadiff 82, Proc. int. Conf., Würzburg 1982, Lect. Notes Math. 1017, 575-596 (1983).

MSC:
35B32 Bifurcations in context of PDEs
35Q99 Partial differential equations of mathematical physics and other areas of application
35P30 Nonlinear eigenvalue problems and nonlinear spectral theory for PDEs
58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces