Volume 9, Issue 3 Friedrich Philipp Carsten Trunk Spectral points of type π+ and type π- of closed operators in indefinite inner product spaces 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 Friedrich Philipp Carsten Trunk Find more articles with the same keywords indefinite inner product selfadjoint operator spectrum of positive and negative type spectrum of type π+ and π- local spectral function perturbation theory Find more articles with the same subject classes 47A10 47B50 46C20 47A55