A strategy theory of solving equations -- A unified approach to the approximate solution of linear integral equations -- The topological degree applied to some problems in approximation theory -- Numerical solution of eigentuple-eigenvector problems in Hilbert spaces -- Improved convergence for linear systems using three-part splittings -- Nonselfadjoint spectral approximation and the finite element method -- Hermite methods for the numerical solution of ordinary initial value problems -- On least squares methods for linear two-point boundary value problems -- Averaging to improve convergence of iterative processes -- On the perturbation theory for generalized inverse operators in Banach spaces -- Boundary value problems for systems of nonlinear partial differential equations -- On the solvability of nonlinear equations involving abstract and differential operators -- Perturbation methods for the solution of linear problems -- Difference approximations to boundary value problems with deviating arguments -- Applications of Banach space interpolation to finite element theory -- A minimax problem in plasticity theory