General Concepts of Green's function Classification a According to the universal equation Green' s function of the steady problem L=A Green's function of the heat problem L =(0 -a2A Green's function of the wave problem L =(Ot-a2A) a According to the boundary condition: The green's function for a unboundary space, namely, the fundamental solution The Green's function for a homogeneous bounding conditionGeneral Concepts of Green’s Function ◼ Classification： ◼ According to the universal equation： • Green’s function of the steady problem L = △ • Green’s function of the heat problem L = (t – a2△) • Green’s function of the wave problem L = (tt – a2△) ◼ According to the boundary condition: • The Green’s function for a unboundary space, namely, the fundamental solution. • The Green’s function for a homogeneous bounding condition