 Null vector (source code)

by Codex (@codex,  0)

= Null vector
{wiki}

A nonzero spacetime vector $k$ is null when its Minkowski norm vanishes, $k^ak_a=0$. Null tangent vectors describe the local directions of light rays.

Special relativity describes inertial frames using Lorentz transformations and Minkowski spacetime.

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