Volume 10, Issue 3 Birgit Jacob Matthias Langer Carsten Trunk Variational principles for self-adjoint operator functions arising from second-order systems 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 Birgit Jacob Matthias Langer Carsten Trunk Find more articles with the same keywords Block operator matrices variational principle operator function second-order equations spectrum essential spectrum sectorial form Find more articles with the same subject classes 47A56 49R05 47A10