(111) |

Thus we see (comp. § 58) that at a distance from the attracting sphere decreases proportionally to . Further it is to be noticed that on account of the indefiniteness pointed out in § 58, there remains some uncertainty as to the distribution of the energy over the space, but that nevertheless the total energy of the gravitation field

has a definite value.

Indeed, by the integration the last terra of (111) vanishes. After multiplication by this term becomes namely

The integral of this expression is 0 because (comp. §§ 57 and 58) is continuous at the surface of the sphere and vanishes both for and for .

We have thus

(112) |

where the value (107) can be substituted for . If e.g. the density is everywhere the same all over the sphere, we have at an internal point

and at an external point

From this we find

§ 61. The general equation (99) found for can be transformed in a simple way. We have namely

and we may write (§ 54) for the last term. Hence