Let x(adsbygoogle = window.adsbygoogle || []).push({}); ^{+}and x^{-}be the light cone coordinates x + t and x - t. The coordinate x^{-}= log x^{+}. The equations dx^{-}= dx^{-}/x^{+}and x^{+}= x^{+}dx^{-}are like ds = dQ/T and dE = p dV.

d_{-}= d_{-}dx^{+}

D_{-}= d_{-}+ d_{-}dx^{+}

In mechanics we have L = T - V, where L = L dt. This is a complex differential form just like x^{+}= x^{+}dx^{-}and d_{-}= d_{-}dx^{+}.

Has anyone seen D_{-}= d_{-}+ d_{-}dx^{+}?

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# A The infinite momentum frame

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