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1. • CommentRowNumber1.
   • CommentAuthorTodd_Trimble
   • CommentTimeDec 15th 2016
   • PermaLink
   Author: Todd_Trimble
   Format: MarkdownItexCan someone tell me how you make a subscript appear to the left of an expression? For example, instead of $R$ appearing to the right as in $Mod_R$, make it appear to the left of $Mod$ as a subscript?

   Can someone tell me how you make a subscript appear to the left of an expression? For example, instead of $R$ appearing to the right as in $Mod_R$, make it appear to the left of $Mod$ as a subscript?

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeDec 15th 2016
   • (edited Dec 15th 2016)
   • PermaLink
   Author: Urs
   Format: MarkdownItexThis is a hack, but it works: {}_R Mod gives ${}_R Mod$

   This is a hack, but it works:

      {}_R Mod
   

   gives ${}_R Mod$

3. • CommentRowNumber3.
   • CommentAuthorTodd_Trimble
   • CommentTimeDec 15th 2016
   • PermaLink
   Author: Todd_Trimble
   Format: MarkdownItexOh, I should have thought of that. Thanks, Urs!

   Oh, I should have thought of that. Thanks, Urs!

4. • CommentRowNumber4.
   • CommentAuthorMike Shulman
   • CommentTimeDec 15th 2016
   • PermaLink
   Author: Mike Shulman
   Format: MarkdownItexYeah, I think that's the best there is. I used to use that hack in ordinary LaTeX too, until i discovered the `\prescript` command in the `mathtools` package; but I don't think iTeX has a `\prescript`.

   Yeah, I think that’s the best there is. I used to use that hack in ordinary LaTeX too, until i discovered the \prescript command in the mathtools package; but I don’t think iTeX has a \prescript.

5. • CommentRowNumber5.
   • CommentAuthorRodMcGuire
   • CommentTimeDec 15th 2016
   • (edited Dec 16th 2016)
   • PermaLink
   Author: RodMcGuire
   Format: MarkdownItexiTeX does provide [`\multiscripts`](https://golem.ph.utexas.edu/~distler/WebTeX/docs/wtxsec5.html#SUPER). Is this being eschewed as non standard? $$\multiscripts{_0^2_1}{R}{_i^j_k} \quad \quad \multiscripts{_R}{Mod}{} \quad or \quad \multiscripts{_R} Mod {}$$

   iTeX does provide \multiscripts. Is this being eschewed as non standard?

   $$\multiscripts{_0^2_1}{R}{_i^j_k} \quad \quad \multiscripts{_R}{Mod}{} \quad or \quad \multiscripts{_R} Mod {}$$
6. • CommentRowNumber6.
   • CommentAuthorTodd_Trimble
   • CommentTimeDec 15th 2016
   • PermaLink
   Author: Todd_Trimble
   Format: MarkdownItexThanks, Rod! This might be worth putting somewhere in the nLab, such as [[HowTo]].

   Thanks, Rod! This might be worth putting somewhere in the nLab, such as HowTo.

7. • CommentRowNumber7.
   • CommentAuthorMike Shulman
   • CommentTimeDec 16th 2016
   • PermaLink
   Author: Mike Shulman
   Format: MarkdownItexCool! Yes, we should document that on the lab.

   Cool! Yes, we should document that on the lab.

8. • CommentRowNumber8.
   • CommentAuthorTodd_Trimble
   • CommentTimeDec 17th 2016
   • PermaLink
   Author: Todd_Trimble
   Format: MarkdownItexI've documented it [here](https://ncatlab.org/nlab/show/HowTo#survey_of_available_math_typesetting_commands), although I'm not sure it's the best place to put it.

   I’ve documented it here, although I’m not sure it’s the best place to put it.

9. • CommentRowNumber9.
   • CommentAuthorRodMcGuire
   • CommentTimeDec 18th 2016
   • PermaLink
   Author: RodMcGuire
   Format: MarkdownItex> I’m not sure it’s the best place to put it. I don't know about location either, though that may not be all that important. When I try to find something like this I generally Google the whole site. I've edited what you wrote to give it more words and phrases that might be searched for so it will more likely turn up in a search. > This is worth perusing carefully; for example, iTeX does not provide a command such as `\prescript` to generate left subscripts. Instead it contains the more general `\multiscripts` command to typeset subscripts and superscripts both to the left and right of an expression. For instance, the math mode text `\multiscripts{_0^2_1}{R}{_i^j_k}` produces $$\multiscripts{_0^2_1}{R}{_i^j_k}$$

   I’m not sure it’s the best place to put it.

   I don’t know about location either, though that may not be all that important. When I try to find something like this I generally Google the whole site. I’ve edited what you wrote to give it more words and phrases that might be searched for so it will more likely turn up in a search.

   This is worth perusing carefully; for example, iTeX does not provide a command such as \prescript to generate left subscripts. Instead it contains the more general \multiscripts command to typeset subscripts and superscripts both to the left and right of an expression. For instance, the math mode text \multiscripts{_0^2_1}{R}{_i^j_k} produces

   $$\multiscripts{_0^2_1}{R}{_i^j_k}$$
10. • CommentRowNumber10.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 18th 2016
    • PermaLink
    Author: Todd_Trimble
    Format: MarkdownItexCool; thanks, Rod.

    Cool; thanks, Rod.