Gap estimates of Schrödinger operator

Roger Chen
1997 Pacific Journal of Mathematics  
By a transformation of metric using the first eigenfunction, we obtain lower bounds for all eigenvalues of Schrödinger operator with the Neumann boundary condition. Global estimates for first eigenfunction are needed and this is achieved by the Moser iteration technique.
doi:10.2140/pjm.1997.178.225 fatcat:qg3mm4gplvgz3kzohe7iltpmim