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A point in space-time is specified by $x^0,x^1,x^2,x^3$, in which $x^0\equiv ct,x^1\equiv x, x^2\equiv y, x^3\equiv z$. A four-vector in this notation can be written as as

x^\mu\equiv (x^0,x^k)\equiv (x^0,x^1,x^2,x^3) ,
\end{displaymath} (2.8)

where $\mu=0,1,2,3$ and $k=1,2,3$.

Douglas M. Gingrich (gingrich@