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m Disambiguating links to Dirac (disambiguation) (link changed to Paul Dirac) using DisamAssist. |
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When one takes a flash photograph, the recorded image shows the object
as the front of the [[Electromagnetic radiation|light wave]] from the flash crosses the object.
Thus [[Paul Dirac|Dirac]] used the terminology "light-front" and "front form" in
contrast to ordinary instant time and "instant form".<ref name="Dirac" />
Light waves traveling in the negative <math>z</math> direction
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