3 momentum
Explanation:
http://www.physicsforums.com/archive/index.php/t-226699.html
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Note added at 1 sat (2012-01-29 16:01:53 GMT)
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should clarify that, given a 4-momentum vector,
the 3-momentum is essentially the "spatial-part" according to a given observer.
That is, the 3-momentum is [obtained from] the vector-component of the 4-momentum that
is [Minkowski-]perpendicular to an observer's 4-velocity.
From a given 4-momentum vector, different observers will determine different 3-momentum vectors.
|   Davor Ivic
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The translation workplace 
peer agreement (net): +3
