Abstract
Existing critical point theories including metric and topological critical point theories are difficult to be applied directly to some concrete problems in particular polyhedral settings, because the notions of critical sets could be either very vague or too large. To overcome these difficulties, we develop the critical point theory for nonsmooth but Lipschitzian functions defined on convex polyhedrons. This yields natural extensions of classical results in the critical point theory, such as the Liusternik-Schnirelmann multiplicity theorem. More importantly, eigenvectors for some eigenvalue problems involving graph 1-Laplacian coincide with critical points of the corresponding functions on polytopes, which indicates that the critical point theory proposed in the present paper can be applied to study the nonlinear spectral graph theory.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant Nos. 11822102 and 11421101). The second author was supported by Beijing Academy of Artificial Intelligence (BAAI). The third author was supported by the project funded by China Postdoctoral Science Foundation (Grant No. BX201700009).
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Chang, KC., Shao, S., Zhang, D. et al. Nonsmooth critical point theory and applications to the spectral graph theory. Sci. China Math. 64, 1–32 (2021). https://doi.org/10.1007/s11425-019-1625-8
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DOI: https://doi.org/10.1007/s11425-019-1625-8