If the K-L integral Equation 10.5-3 has two solutions, φ 1 (t) and φ 2 (t) corresponding to the eigenvalues λ 1 and λ 2 , then show that if λ 1 ≠0 and λ 2 ≠λ 1 we must have (Hint: Substitute for φ 1 (t) in the above expression and use the Hermitian symmetry of K (t, s), that is, K (t, s ) = K ∗ (s, t ))