Volume 1, Issue 4 Alexander G. Ramm P. N. Shivakumar Inequalities for the minimal eigenvalue of the laplacian in an annulus Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Alexander G. Ramm P. N. Shivakumar Find more articles with the same keywords inequalities estimation of eigenvalues perturbation theory Find more articles with the same subject classes 35J05 35P15