OP-00280 Open The sharp ratio of the first two buckling eigenvalues SP · AIM Open Applied Problems · buckling eigenvalues · clamped plates · eigenvalue ratios
OP-00297 Open The polygonal Payne–Pólya–Weinberger ratio conjecture SP · AIM Open Applied Problems · Dirichlet eigenvalues · eigenvalue ratios · polygons
OP-00306 Open The Robin eigenvalue ratio at fixed volume SP · AIM Open Applied Problems · eigenvalue ratios · isoperimetric inequalities · Robin eigenvalues