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# Theor./Particle: 4-vector notation (gradients, scalars, metrics)

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1. Not sure if this is the right area to post this, sorry!

I'm doing a 3rd year Uni (Physics) module on Theoretical Elementary Particle Physics and this is the first time I've had to use 4-vector notation, which I've struggled with grasping.Can anyone recommend any good resources for understanding it? I've looked over my lecture notes and googled resources from other Unis but I keep getting lost amongst the notation!

I don't quite understand the difference (or use) between metrics, gradients, and scalars. I understand them in the typical sense of course (scalars have no direction, gradients represent change.. not sure about metrics except in vague a space-time sense), just not in this new sense.

Also, there's an exercise of making a scalar by using a contra-variant vector and a co-variant vector, but I am not sure how it shows that scalars are the same in all (or 2) frames of reference.

Thanks for any help!

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