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m (WP:CHECKWIKI error fix for #64. Do general fixes if a problem exists.  using AWB (9549)) 

Assume we're working with a (d,1) Lorentzian signature.
Instead of the standard coordinate system (using [[
:<math>ds^2=dt^2+\delta_{ij}dx^i dx^j</math>,
with <math>i,j=1,\dots,d</math> we have
== See also ==
* [[NewmanPenrose formalism]]
{{relativitystub}}▼
[[Category:Theory of relativity]]
▲{{relativitystub}}
