In the past thirty years, nonlinear analysis has become part of the mainstream research fields in contemporary mathematical analysis. Theories and methods in nonlinear analysis have been successfully applied to the study of differential and integral equations, which have their roots in geometry, astronomy, fluid and elastic mechanics, physics, chemistry, biology, control theory, image processing, and economics.

The aim of this Special Issue is to collect original and high-quality research and review articles related to the development of the theory and method of nonlinear analysis and their applications.

Potential topics include but are not limited to the following:

• Fixed point theory and methods of computing fixed points
• Variational analysis
• Nonlinear eigenvalue problems and nonlinear spectral theory
• Positive operator inequality and its applications in operator equation spectrum theory
• Differential and integral equations
• Functional differential equations