Conference on the Theory of Ordinary and Partial Differential Equations : Held in Dundee Scotland March 28–31 1972 Recessive solutions of linear differential equations with polynomial coefficients Approximation by functions of fewer variables Affine control processes Abstract unilateral problems Regularity for some degenerate differential operators Singular elliptic perturbations of vanishing first order differential operators Perturbations of the dirac operator On optimal control problems with bounded state variables Quelques propriétés ‘génériques’ des systèmes à commande Greens functions for pairs of formally selfadjoint ordinary differential operators Recent results in the theory of variational inequalities Singular perturbations of elliptic sesquilinear forms Some new aspects of the line method for parabolic differential equations On boundary value problems of generalized analytic functions Polynomial solutions of differential equations with Bi — Orthogonal properties Champs de vecteurs et régularité des solutions de certains problèmes de dirichlet variationnels Symmetric relations on a Hilbert space Fixed point theorems for Fréchet spaces Boundary value problems involving the Thomas Fermi equation The initial value problem for operators which can be factorized into a product of Klein Gordon operators An oscillation theorem for linear systems with more than one degree of freedom Some existence results for nonlinear steklov problems The deficiency indices and spectrum associated with self adjoint differential expressions having complex coefficients The generalized Ahlfors Heins theorem in certain D dimensional cones On a lower bound of a second order linear differential operator with an integrable p coefficient Some dirichlet and separation results for certain differential expressions on finite intervals On certain parabolic differential equations and an equivalent variational problem Turning points in second order elliptic singular perturbation problems Remarks on interpolation in spaces with weights Perturbed bifurcation and buckling of circular plates Oscillation properties of nonselfadjoint differential equations of even order On the non autonomous van der pol equation with large parameter Global attraction and asymptotic equilibrium for nonlinear ordinary equations The functional differential equation y(x)=ay(x)+by(x) and generalisations Multiple solutions of a singularly perturbed boundary value problem arising in chemical reactor theory A liapounov function for an automomous second order ordinary differential equation Boundary values of holomorphic functions and the iterated wave equation Détermination à lAide dindex des solutions périodiques de lequation de Duffing x+2x3= cost Periodic solutions of nonlinear differential systems Bifurcation theory for equations with nonlocal potentials Multi parameter eigenvalue problems and k linear operators An epidemic model with two populations Existence theorems for operators of monotone type Elliptic partial differential equations may be related by a change of independent variables.