Table of Contents

Equivalence of differential operators.- Some unitarily equivalent differential operators with finite and infinite singularities.- The land beyond bessel: A survey of higher special functions.- Nonlinear two-point boundary value problems.- On nonlinear boundary value problems for an elliptic system in the plane.- Totally singular extensions of the Cauchy problem for a special class of partial derivative operators with distributional coefficients.- Complex extensions of a submanifold of solutions of the sine-gordon equation.- Remark on bifurcation problems with several parameters.- Asymptotic theory and deficiency indices for fourth and higher order self-adjoint equations: A simplified approach.- On the spectra of Schrödinger operators with a complex potential.- Non-modal eigenfunction expansions.- Asymptotic distribution of eigenvalues of elliptic operators on unbounded domains.- Generalized hyperanalytic function theory.- Some spectral gap results.- A regular left-definite eigenvalue problem with eigenvalue parameter in the boundary conditions.- Some topics in nonlinear wave propagation.- An ordering of oscillation types for y(n) + py = 0.- Fundamental properties of the solutions of quasilinear differential equations of the fifth order.- Oscillation properties of weakly nonlinear differential equations.- On boundary integral equation methods in stationary electromagnetic reflection.- Norm inequalities for derivatives.- Fixed point theorems.- Automatic control of errors for invariant imbedding.- A bound for solutions of a fourth order dynamical system.- Reducibility of almost periodic linear systems.- Convergence of solutions of infinite delay differential equations with an underlying space of continuous functions.- On a system of non linear strongly coupled partialdifferential equations arising in biology.- Differential operators with discrete spectrum.- On spectral theory for the linear selfadjoint equation Fy =—Gy.- Estimates for some free boundary problems.- A new proof of existence of similarity solutions.- Symmetry and bifurcation from multiple eigenvalues.- Convergence to a travelling wave in an initial-boundary value problem.- Geometric remarks on second order criteria for maxima and minima.- Variational methods and almost solvability of semilinear equations.