Local two-sided bounds for eigenvalues of self-adjoint operators
Local two-sided bounds for eigenvalues of self-adjoint operators
We examine the equivalence between an extension of the Lehmann-Maehly-Goerisch method developed a few years ago by Zimmermann and Mertins, and a geometrically motivated method developed more recently by Davies and Plum. We establish a general framework which allows sharpening various previously known results in these two settings and determine …