NOTE: Much of this chapter material is no longer valid. I will update it as soon as possible. In the meantime, see the demo files such as kerrnp for examples.
This chapter presents the other packages in REDTEN that are concerned with the various formalisms used to derive information about a metric: the frame package (a tetrad formalism), a spinor package and the Newmann-Penrose package. Incidental to this discussion is the complex arithmetic package. These packages have not reached the same fullness of developement as the GR package described in chapter 4.