Electronic Journal of Differential Equations, Vol. 2005(2005), No. 24, pp. 1-9. Title: Even order self adjoint time scale problems Authors: Douglas R. Anderson (Concordia College, Moorhead, MN, USA) Joan Hoffacker (Clemson Univ., Clemson, SC, USA) Abstract: Even order self adjoint differential time scale expressions are introduced, together with associated self adjoint boundary conditions; the result is established by induction. Several fourth-order nabla-delta delta-nabla examples are given for select self adjoint boundary conditions, together with the specific corresponding Green's functions over common time scales. One derived Green's function is shown directly to be symmetric. Submitted February 6, 2005. Published February 22, 2005. Math Subject Classifications: 34B10, 39A10. Key Words: Time scales; boundary value problem; symmetric Green's function.