Infinitely many solutions of superlinear boundary value problems with rotational symmetry

Dual variational methods in critical point theory and applications

Antonio Ambrosetti, Paul H. Rabinowitz · Journal of Functional Analysis · 1973 · 4.4K citations

Natural Sciences, Mathematics, Physics +14

A generalized Morse theory

Richard S. Palais, Stephen T. Smale · Bulletin of the American Mathematical Society · 1964 · 300 citations · Full text

Natural Sciences, Mathematics, Computational Geometry +12

Characteristic values associated with a class of nonlinear second-order differential equations

Zeev Nehari · Acta Mathematica · 1961 · 237 citations

Natural Sciences, Mathematics, Differential Equations +10

Variational methods for nonlinear elliptic eigenvalue problems

Felix E. Browder · Bulletin of the American Mathematical Society · 1965 · 142 citations · Full text

Natural Sciences, Mathematics, Physics +14

Functional analysis and Galerkin's method.

Lamberto Cesari · The Michigan Mathematical Journal · 1964 · 133 citations

Computing, Computational Engineering, Computational Mechanics +11