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Lets say I want to type $i_0$ raised to the power $p$.

Which is the correct way:

  • $i_0^p$ (the simplest)

  • ${i_0}^p$

  • ${i^p}_0$

I think they appear slightly differently.

Thanks for help.

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4

The last is wrong, the middle one ${i_0}^p$ has some appeal as being logically closer to the mathematical meaning, however TeX is fundamentally a typesetting system not a semantic math markup, and the conventional setting would be to put the sub and superscript on the same base, to give a tighter horizontal spacing so $i_0^p (or in strictly correct latex syntax, i_{0}^{p} which produces the same thing).

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