I'm reading Griffith's Elementary particles and I'm stuck on the math for one of the examples, could anyone show me what I'm missing or point me in the right direction?(adsbygoogle = window.adsbygoogle || []).push({});

I attached a pdf (of the word doc I was using) that shows what I did so far since I'm really bad with LaTeX and it would've taken me an hour to write it for this post.

Thanks in advanced for any and all help/direction; I feel so useless for having to ask, but I need to get through this.

Elwin

**any review material on the math would be nice if you have recommendations!**

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# Proca Lagrangian (Math troubles with four vectors)

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