  A method for constructing metric gravity's N-body Lagrangian is developed
which uses iterative, liner algebraic euqations which enforce invariance
properties of gravity --- exterior effacement, interior effacement, and the
time dilation and Lorentz contraction of matter under boosts. The method is
demonstrated by obtaining the full 1/c^4 order Lagrangian, and a combination of
exterior and interior effacement enforcement permits construction of the full
Schwarzschild temporal and spatial metric potentials.

General Relativity and Quantum Cosmology