- GHP formalism
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 ofspacetime .ee also
*
General relativity
*NP formalism References
*cite web | author=Geroch, Robert, Held, A. and Penrose, Roger| title=A space-time calculus based on pairs of null directions| work=JMP| url=http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JMAPAQ000014000007000874000001&idtype=cvips&gifs=Yes| accessdate=February 19| accessyear=2005
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