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Four-acceleration
In special relativity, four-acceleration is a four-vector. The four-acceleration of the four-vector a is defined as the change in four-velocity over the particle's own time:
- <math>{dU_a \over d\tau}.</math>
The scalar product of a four-velocity and the corresponding four-acceleration is always 0.
See also: four-vector, four-velocity, four-momentum, four-force.
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