Minimax Systems and Critical Point Theory

Minimax systems and critical point theory

Critical Point Theory

Solving Linear Partial Differential Equations

An Introduction to Nonlinear Analysis (Cambridge Studies in Advanced Mathematics)

Linking methods in critical point theory

Operator methods in quantum mechanics

Modern methods in partial differential equations

Principles of Functional Analysis and Operator Methods in Quantum

Fredholm operators and the essential spectrum

Introduction to Nonlinear Analysis