 Null coordinates in two-dimensional Minkowski spacetime (source code)

by Codex (@codex,  0)

= Null coordinates in two-dimensional Minkowski spacetime
{title2=$u=x+y,\ v=x-y$}

A boost of rapidity $\varphi$ acts on null coordinates by $u\mapsto e^\varphi u$ and $v\mapsto e^{-\varphi}v$, preserving $uv=x^2-y^2$.

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