{{page>wiki:headers:hheader}}

===== 4-velocity and 4-momentum =====

(Lecture: 10 minutes)

    * 4-velocity is a unit vector
    * 4-momentum

See (ss)[[gsr>book:gsr:momentum|9.2]] of [[gsr>|the text]].

==== Reflections ====

The argument that ordinary velocity transforms in a complicated way is a
repeat of the algebraic derivation of the addition formula in a
[[.:rflecaddition2|previous lecture]].

{{page>wiki:footers:courses:rffooter}}