Volume 8, Issue 1 Felix L. Schwenninger Hans Zwart Generators with a closure relation 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 Felix L. Schwenninger Hans Zwart Find more articles with the same keywords block operator semigroup of operators semi-inner-product dissipative operator Find more articles with the same subject classes 47D06 47B44 34G10