The identity of weak and strong extensions of differential operators

The method of orthogonal projection in potential theory

Hermann Weyl · Duke Mathematical Journal · 1940 · 328 citations

Natural Sciences, Mathematics, Physics +13

Functions of several variables and absolute continuity, II

Charles B. Morrey · Duke Mathematical Journal · 1940 · 97 citations

Natural Sciences, Property Law, Continuity Of Care +8

On Differential Operators in Hilbert Spaces

Kurt Friedrichs · American Journal of Mathematics · 1939 · 67 citations

Natural Sciences, Mathematics, Physics +13

Existence and differentiability theorems for the solutions of variational problems for multiple integrals

Charles B. Morrey · Bulletin of the American Mathematical Society · 1940 · 43 citations · Full text

Natural Sciences, Mathematics, Differential Equations +6

Functions of several variables and absolute continuity, I

J. W. Calkin · Duke Mathematical Journal · 1940 · 37 citations

Engineering, Property Law, Categorical Data Analysis +7