Volume 15, Issue 2 R. S. Laugesen Z. C. Pan S. S. Son Neumann eigenvalue sums on triangles are (mostly) minimal for equilaterals 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 R. S. Laugesen Z. C. Pan S. S. Son Find more articles with the same keywords isodiametric isoperimetric free membrane Find more articles with the same subject classes 35P15 35J20