[tex](adsbygoogle = window.adsbygoogle || []).push({});

P = \left( \begin{array}{c}

E/c

\\ \bar{p}

\end{array}\right)

[/tex]

and

[tex]

U = \left( \begin{array}{c}

\gamma c

\\ \gamma \bar{v}

\end{array}\right)

[/tex]

right? But I frequently see in textbooks that [itex] P = m_0 U [/itex]. Surely,

[tex]m_0 U =

\left( \begin{array}{c}

\gamma m_0 c

\\ \gamma m_0 \bar{v}

\end{array}\right)

=

\left( \begin{array}{c}

E/c

\\ \gamma \bar{p}

\end{array}\right)

\neq

\left( \begin{array}{c}

E/c

\\ \bar{p}

\end{array}\right)

[/tex]

So how does this work?

Yours confusedly

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# 4 Momentum and 4 velocity relationship

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