GHP formalism

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The GHP formalism (or Geroch-Held-Penrose formalism) is a technique used in the mathematics of general relativity that involves singling out a pair of null directions at each point of spacetime.

[edit] See also

• General relativity
• NP formalism

[edit] References

• Geroch, Robert, Held, A. and Penrose, Roger. A space-time calculus based on pairs of null directions. JMP. Retrieved on February 19, 2005.