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physics/spacetime/special-formalism.md: update

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Luc Bijl 2025-09-14 16:37:04 +02:00
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docs/physics/spacetime/special-formalism.md
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@ -247,7 +247,7 @@ The four-acceleration can only change the direction of the four-velocity, as the
A related concept is the **four-force** which in terms of the four-momentum may be defined as
$$
\mathbf{f} = d_\tau \mathbf{p} \overset{\mathrm{def}}{=} m d^2_\tau \mathbf{a}.
\mathbf{f} = d_\tau \mathbf{p} \overset{\mathrm{def}}{=} m \mathbf{a}.
$$
In the case that a constant force $F$ in the $x$ direction acts on a body we have that the four-force on that body adheres to