Four-vector

A four-vector is a four element vector that is a rank 1 class tensor in that its element notation expression carries 1 index and it transforms according to a tensor transformation. For example a four vector expressed as a contravariant rank 1 tensor $T^{\mu }$ transforms according to

$T'^{\mu }={\frac {\partial x'^{\mu }}{\partial x^{\nu }}}T^{\nu }$

and the four vector expressed as a covariant rank 1 tensor $T_{\mu }$ transforms according to

$T'_{\mu }={\frac {\partial x^{\nu }}{\partial x'^{\mu }}}T_{\nu }$

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