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Would you advise to use "\text{}" for variable names in an equation or not (in a paper on econometrics)? Equation 2.1 is with the use of "\text{}" and equation 2.2 without. enter image description here

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    You shouldn't use \text but \mathit or \mathsf. \text is for text like and follows, not for math variables. Mar 23, 2022 at 12:39
  • Welcome to TeX:SE! No, correct is mathrm{...}.
    – Zarko
    Mar 23, 2022 at 12:39

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No never use \text for variable names but never use the default math italic either.

\text selects the text font current ouside the math, so for example will be italic in a theorem. It is useful if you want to get a phrase of non-mathematical text inside the display.

The default math italic font uses wide sidebearings so adjacent letters do not look like a word, but look like a product of one-letter variables.

Use \mathrm{Gini} to get a roman upright identifier.

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