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I want to have upright-shape subscripts while in math mode and that by default, i.e. I want to redefine the underscore _

I have found a solution for that here Redefine underscore to produce roman subscript but it will also overwrite _ when it is not used in math mode and cause problems, for example when including a figure that has an underscore in the name.

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    Welcome to tex.sx. Commented May 4, 2020 at 14:57
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    I found the answer here tex.stackexchange.com/questions/12927/…
    – Rene
    Commented May 4, 2020 at 15:19
  • I've taken the liberty of editing your posting to clarify that what you want is upright-shaped glyphs in subscript positions. The term "roman" is, in my opinion, unnecessarily confusing since some fonts provide both slanted-Roman as well as upright-Roman glyphs, along with both slanted-italic and upright-italic [yes, there is such a thing] glyphs.
    – Mico
    Commented May 4, 2020 at 16:52
  • See also Non-italic (roman) subscripts in math mode.
    – Mico
    Commented May 4, 2020 at 16:54

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