Multiple solutions are shown to exist for the system Bu = λF(u), where λ > 0, B is a positive definite matrix and F is ‘superquadratic’ or ‘subquadratic’. We make use of Clark's theorem in critical point theory to obtain our results and provide examples to show that the results are sharp.
Cite this article
Gen-Qiang Wang, Sui Sun Cheng, A remark on multiple solutions for a nonlinear eigenvalue problem. Port. Math. 65 (2008), no. 4, pp. 497–507DOI 10.4171/PM/1823