Volume 15, Issue 4 Koen van den Dungen Lennart Ronge The APS-index and the spectral flow 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 Koen van den Dungen Lennart Ronge Find more articles with the same keywords Atiyah-Patodi-Singer index redholm pairs of projections spectral flow Find more articles with the same subject classes 47A53 58J20 58J30