If I have the same equation, and I wanna use it in two different chapters of my dissertation how can I write it, and which of the following way is correct?

1- can I write the equation in both chapters as follows:

i.e, In chapter-3 P=n.z.I (3.1)

I.e, In chapter-4 P=n.z.I (4.1)

2- or can I write it in the first chapter and I just mention it in the other chapter without writing the equation again.

i.e, In chapter-3 P=n.z.I (3.1) and I will just mention it in chapter-4 i.e, as expressed before in chapter-3 equation-(3.1)

If any of the above ways is not correct, please tell me the right way and support me with documents or references even a thesis if available.

Thank you so much in advance.

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