The limit-4 case of fourth-order self-adjoint differential equations
M. S. P. Eastham · Proceedings of the Royal Society of Edinburgh Section A Mathematics · 1977
Synopsis A new method is developed for identifying real-valued coefficientsr(x),p(x), andq(x)for which all solutions of the fourth-order differential equation areL2(0, ∞). The results are compared with those derived from the asymptotic theory of Devinatz, Walker, Kogan and Rofe-Beketov.