Some Generalized Eigenfunction Expansions And Uniqueness Theorems
Some Generalized Eigenfunction Expansions And Uniqueness Theorems
Arthur S Peters
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L8), as given by the authors noted above, depend upon explicit asymptotic estimates of the behavior of eigenfunctions and eigenvalues as A — »• 00 . For a proof of (2. 18) with respect to the second order system (2, 9)- (2. 11); and one which does not depend on specific asymptotic evalua- tions, see Peters [8]. The formula (2. L8) leads to the expansion of f(y) into an infinite sum of residues. If C is a circle with center at A^ containing no other eigenvalue we have 12 (2. 19) 00 -, r f(y) = -...) p^ r Q[G(t, y, z), f(t)] n=0 dz n 00 5 Q ^ 7^ G(t, y, z)clz, f(t) n If (X»(z) has a zero of order k at z = A, the corresponding term in the expansion (2. 19) is (2. 20) Q[?^(t, y, n), f(t)] where 9^(t, y, n)/(z ->^„) comes from the Laurent expansion of G(t, y, z) for the neighborhood of z = A . The function 9 can be obtained by substituting the expansion 00 G(t, y, z) = y— (z - A^)* 0_^(t, y, n) + T~ [z - A^)* 9^(t, y, n) in the equation LG(t, y, z) -A^r(t)G - (z -A^)rG = 5(t - y) and the boundary conditions G^(0, y, z) +PQG(0, y, z) = a^A^G(0, y, z) + a^(z - A^)G(0, y, z), G^(l, y, z) + p^G(l, y, z) = a^A^G(l, y, z) + a^(z -A^)G(l, y, z) which define G(t, y, z).
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