Linear Second-Order Partial Differential Equations of the Parabolic Type

Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. I

Shmuel Agmon, Avron Douglis, Louis Nirenberg · Communications on Pure and Applied Mathematics · 1959 · 3.7K citations

Monge-ampere Equation, Elliptic Equation, Geometric Partial Differential Equation +4

Continuity of Solutions of Parabolic and Elliptic Equations

John C. Nash · American Journal of Mathematics · 1958 · 1.2K citations

Elliptic Equation, Elliptic Equations, Nonlinear Hyperbolic Problem +1

Symmetric hyperbolic linear differential equations

Kurt Friedrichs · Communications on Pure and Applied Mathematics · 1954 · 664 citations

Differential Equations, Nonlinear Hyperbolic Problem, Hyperbolic Equation +1

Symmetric positive linear differential equations

Kurt Friedrichs · Communications on Pure and Applied Mathematics · 1958 · 601 citations

Lie Point Symmetry, Oscillation Theory, Nonlinear Functional Analysis

Remarks on strongly elliptic partial differential equations

Louis Nirenberg · Communications on Pure and Applied Mathematics · 1955 · 396 citations

Monge-ampere Equation, Elliptic Equation, Elliptic Function