If you are looking for something in a cluttered

environment, it helps to know what you are looking for.

In a flat desert, it does not matter so much since anything

that sticks out is probably interesting.

Einstein’s equations are horribly complicated.

10 equations, each with hundreds of terms.

Impossible by paper and pencil to solve except

in simple situations.

Looking for What?

Solve Einstein Equations for Orbiting objcts

If objects far apart (weak waves)-- use techniques

Einstein started

Post Newtonian Formalism (PPN)