Page:BatemanConformal.djvu/4

1908.] First, let V be a homogeneous function of degree zero. We evidently have

But, since V is a homogeneous function of degree zero,

and ν = -1, therefore

If, instead of (l, m, n, λ, μ, ν), we use the usual hexaspherical coordinates defined by the relations

the equation takes the more symmetrical form

This relation shows that a homogeneous function of degree zero, which is a solution of

i.e., of