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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:
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
.