Palais–Smale compactness condition
= Palais–Smale compactness condition
{wiki=Palais–Smale_compactness_condition}
The Palais–Smale compactness condition is a criterion used in the context of variational methods and critical point theory, particularly when dealing with the analysis of functionals on Banach spaces or Hilbert spaces. It plays a crucial role in the study of minimization problems and the existence of critical points.