We apply Gromov’s ham sandwich method to get: (1) domain monotonicity (up to a multiplicative constant factor); (2) reverse domain monotonicity (up to a multiplicative constant factor); and (3) universal inequalities for Neumann eigenvalues of the Laplacian on bounded convex domains in Euclidean space.
@article{bwmeta1.element.doi-10_1515_agms-2016-0015, author = {Kei Funano}, title = {Applications of the `Ham Sandwich Theorem' to Eigenvalues of the Laplacian}, journal = {Analysis and Geometry in Metric Spaces}, volume = {4}, year = {2016}, zbl = {1354.58024}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_1515_agms-2016-0015} }
Kei Funano. Applications of the ‘Ham Sandwich Theorem’ to Eigenvalues of the Laplacian. Analysis and Geometry in Metric Spaces, Tome 4 (2016) . http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_1515_agms-2016-0015/