Ralston, J. V. Approximate eigenfunctions of the Laplacian. (English) Zbl 0385.58012 J. Differ. Geom. 12, 87-100 (1977). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 16 Documents MSC: 58J50 Spectral problems; spectral geometry; scattering theory on manifolds 35P15 Estimates of eigenvalues in context of PDEs 58J60 Relations of PDEs with special manifold structures (Riemannian, Finsler, etc.) 53C22 Geodesics in global differential geometry 53C20 Global Riemannian geometry, including pinching PDFBibTeX XMLCite \textit{J. V. Ralston}, J. Differ. Geom. 12, 87--100 (1977; Zbl 0385.58012) Full Text: DOI