Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A vector in fourdimensional vector space, especially one having three spatial and one temporal dimensions
Etymologies
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Examples

The expression for this action A is where where is the fourvector position of the ith particle as a function of some parameter.

It would also spoil the Lorentz invariance by itself because the entropy density is a time component of a fourvector (am entropy current) and its nonzero
Comments
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