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    • CommentRowNumber1.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 15th 2016

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

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeDec 15th 2016
    • (edited Dec 15th 2016)

    This is a hack, but it works:

       {}_R Mod
    

    gives RMod{}_R Mod

    • CommentRowNumber3.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 15th 2016

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

    • CommentRowNumber4.
    • CommentAuthorMike Shulman
    • CommentTimeDec 15th 2016

    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.

    • CommentRowNumber5.
    • CommentAuthorRodMcGuire
    • CommentTimeDec 15th 2016
    • (edited Dec 16th 2016)

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

    Ri j k 0 2 1 ModR orModR \multiscripts{_0^2_1}{R}{_i^j_k} \quad \quad \multiscripts{_R}{Mod}{} \quad or \quad \multiscripts{_R} Mod {}
    • CommentRowNumber6.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 15th 2016

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

    • CommentRowNumber7.
    • CommentAuthorMike Shulman
    • CommentTimeDec 16th 2016

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

    • CommentRowNumber8.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 17th 2016

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

    • CommentRowNumber9.
    • CommentAuthorRodMcGuire
    • CommentTimeDec 18th 2016

    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

    Ri j k 0 2 1 \multiscripts{_0^2_1}{R}{_i^j_k}
    • CommentRowNumber10.
    • CommentAuthorTodd_Trimble
    • CommentTimeDec 18th 2016

    Cool; thanks, Rod.