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## Main Question or Discussion Point

I have noticed three ways to write the momentum 4 vectors

i. P = (E/c, p)

ii. P = (E, p)

iii. P = (E, pc)

The three ways to write the momentum 4 vectors is really confusing since I know how to derive the

way it is written in the form as (i). But the two other forms (ii and iii) does not make any sense at all.

Could someone please "enlighten" me in this matter?

i. P = (E/c, p)

ii. P = (E, p)

iii. P = (E, pc)

The three ways to write the momentum 4 vectors is really confusing since I know how to derive the

way it is written in the form as (i). But the two other forms (ii and iii) does not make any sense at all.

Could someone please "enlighten" me in this matter?

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