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Mathematical Notes, 29Originally published in 1983.The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

Differential equations, Elliptic --- Schrödinger operator. --- Eigenfunctions. --- Functions, Proper --- Proper functions --- Boundary value problems --- Differential equations --- Integral equations --- Operator, Schrödinger --- Differential operators --- Quantum theory --- Schrödinger equation --- Numerical solutions. --- Numerical solutions --- Approximation. --- Ball (mathematics). --- Bounded function. --- Center of mass. --- Coefficient. --- Compact space. --- Complex number. --- Continuous function (set theory). --- Continuous function. --- Discrete spectrum. --- Distribution (mathematics). --- Eigenfunction. --- Eigenvalues and eigenvectors. --- Elliptic operator. --- Equation. --- Equivalence class. --- Essential spectrum. --- Estimation. --- Existential quantification. --- Exponential decay. --- Function space. --- Fundamental theorem of calculus. --- Geometry. --- Ground state. --- Infimum and supremum. --- Lebesgue measure. --- Open set. --- Pointwise. --- Quadratic form. --- Quantity. --- Restriction (mathematics). --- Riemannian manifold. --- Robert Langlands. --- Schrödinger equation. --- Self-adjoint operator. --- Self-adjoint. --- Smoothness. --- Special case. --- Subset. --- Support (mathematics). --- Theorem. --- Upper and lower bounds. --- Weak solution. --- Without loss of generality.