(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hello ,

I have the book (An introduction to tensor calculus , relativity and cosmology) , this book defined the 4-velocity vector as :-

And this book stated that :-

How could we obtain (17.4) from (15.6) ???

Please I need help .

Thanks ……..

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: A question about 4-velocity vector in relativity

**Physics Forums | Science Articles, Homework Help, Discussion**