Robinson, S. B.; Landesman, E. M. A general approach to solvability conditions for semilinear elliptic boundary value problems at resonance. (English) Zbl 0829.35039 Differ. Integral Equ. 8, No. 6, 1555-1569 (1995). The authors show how many well-known existence theorems and several new existence theorems for semilinear elliptic boundary value problems at resonance can be viewed as simple corollaries of some abstract existence results. The abstract existence theorems are derived by using the Leray- Schauder degree theory and the approximate domain technique (for unbounded domains). Reviewer: C.Popa (Iaşi) Cited in 1 ReviewCited in 6 Documents MSC: 35J65 Nonlinear boundary value problems for linear elliptic equations 35A35 Theoretical approximation in context of PDEs Keywords:problems at resonance; Leray-Schauder degree; approximate domain PDFBibTeX XMLCite \textit{S. B. Robinson} and \textit{E. M. Landesman}, Differ. Integral Equ. 8, No. 6, 1555--1569 (1995; Zbl 0829.35039)