... eigenvalues and eigenfunctions for: d4 φ = λφ, dx4 φ(0) = φ (0) = 0, φ(1) = φ (1) = Hint, Solution 144 2 29.5 Hints Hint 29.1 Hint 29.2 Hint 29.3 Hint 29 .4 Write the problem in Sturm-Liouville form to ... = 0, λ = 1 /4 is not an eigenvalue 144 9 Now consider the case λ = 1 /4 A set of solutions is √ (x + 1)(1+ 1 4 )/2 , (x + 1)(1− √ 1 4 )/2 We can write this in terms of the exponential and the logarithm ... p0 y = µy, for a ≤ x ≤ b, α1 y(a) + α2 y (a) = 0, β1 y(b) + β2 y (b) = 0, where the pj are real and continuous and p2 > on [a, b], and the αj and βj are real can be written in the form of a regular...