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Published online by Cambridge University Press: 14 November 2011
Conditions are given on the coefficients p, q and r of the fourth-order, symmetric differentia expression
where y ∈ L2(0, ∞) and L[y] ∈ L2(0, ∞), such that some or all of the individual terms in L[y] are also in L2(0, ∞).