The contravariant four-vector arising in special and general relativity,
![x^mu=[x^0; x^1; x^2; x^3]=[ct; x; y; z],](https://mathworld.wolfram.com/images/equations/PositionFour-Vector/NumberedEquation1.svg) | (1) |
where 
is the speed of light and 
is time. Multiplication of two four-vectors gives the spacetime interval
 |  |  | (2) |
 |  |  | (3) |
 |  |  | (4) |
Position Four-Vector
See also
Four-Vector, Lorentz Transformation, QuaternionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Position Four-Vector." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PositionFour-Vector.html