Lower bounds for higher eigenvalues by finite difference methods

Variational methods for the solution of problems of equilibrium and vibrations

Richard Courant · Bulletin of the American Mathematical Society · 1943 · 1.7K citations · Full text

Natural Sciences, Mathematics, Physics +16

Remarks on de la Vallée Poussin means and convex conformal maps of the circle

Georg Pólya, I. J. Schoenberg · Pacific Journal of Mathematics · 1958 · 155 citations · Full text

Natural Sciences, Mathematics, Geometry +9

New bounds for solutions of second order elliptic partial differential equations

L. E. Payne, Hans F. Weinberger · Pacific Journal of Mathematics · 1958 · 136 citations · Full text

Natural Sciences, Mathematics, Differential Equations +6

Remarks on the maximum principle for parabolic equations and its applications

Avner Friedman · Pacific Journal of Mathematics · 1958 · 120 citations · Full text

Natural Sciences, Mathematics, Differential Equations +6

The structure of idempotent semigroups. I

Naoki Kimura · Pacific Journal of Mathematics · 1958 · 118 citations · Full text

Natural Sciences, Mathematics, Set Theory +5