I am trying to compute the Green's function for one dimensional Laplacian operator. The command I'm using is-
GreenFunction[Laplacian[u[x],x], u[x], x \[Element] FullRegion[1], m]
There is no result for this command, However when I'm using this command for two dimensional case-
GreenFunction[ Laplacian[
u[x, y], {x, y}],
u[x, y], {x , y} \[Element] FullRegion[2], {m, n}],
Mathematica is giving me the correct result. Can someone please help?