Spectral theory of ordinary differential operators.- Quasi-linear equations of evolution, with applications to partial differential equations.- Spectral theory of partial differential operators.- Different applications of convex and nonconvex optimization, especially to differential equations.- Results and problems in the spectral theory of periodic differential equations.- Sobolev embeddings.- Integral inequalities and spectral theory.- On the deficiency indices of powers of formally symmetric differential expressions.- On the spectral theory of schrödinger and dirac operators with strongly singular potentials.- Scattering theory for differential operators, III; exterior problems.- Swirling flow.- A survey of spectral theory for pairs of ordinary differential operators.- Deficiency indices and properties of spectrum of some classes of differential operators.- Eigenvalue problems for nonlinear second order differential equations.- Left-definite multiparameter eigenvalue problems.