The partial differential equation
`(del^2 phi)/(delx^2)` + `(del^2phi)/(del y^2)` + `((del phi)/(del x))` + `((del phi)/(del y))` = 0 has
degree 1 order 2
degree 1 order 1
degree 2 order 1
degree 2 order 2
why giving very late