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m (Robot  Speedily moving category Relativity to Category:Theory of relativity per CFDS.) 
(Disambiguation needed for the link Null) 

In [[Theory of relativityrelativity]], '''lightcone coordinates''' is a special coordinate system where two of the coordinates, x<sup>+</sup> and x<sup></sup> are [[null]]{{dndate=May 2012}} coordinates and all the other coordinates are spatial. Call them <math>x_\perp</math>.
Assume we're working with a (d,1) Lorentzian signature.
