Power indices on the left side

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You can use the command \prescript of the maththools package.

See the following minimal working example:

\documentclass{article}

\usepackage{mathtools}

\begin{document}

\begin{equation*}
    \prescript{2}{}{K}
\end{equation*}

\end{document}
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Victor
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Victor

Updated on August 01, 2022

Comments

  • Victor
    Victor over 1 year

    I'm using {^2K} to write the indices on the left side, but when I do so I get an unwanted space between 2 en K. Is there another way to write the "power" indices on the left side?

    \section*{text}
    \fbox{\parbox{38em}{
    \textbf{text} 
    \textit{text}
    \begin{eqnarray}
    f^{(M)}(z)\underbrace{(K_1,K_2,\ldots,K_M)}_\text{operandi}= \sum\limits_{i=1}^m \sum\limits_{j_1=1}^m \sum\limits_{j_2=1}^m \ldots \sum\limits_{j_M=1}^m {^if_{j_1 j_2\ldots j_M}}{^{j_1}K_1}{^{j_2}K_2}\ldots{^{j_M}K_Me_i},
    \end{eqnarray}
    waarbij $z$ het argument is en
    \begin{eqnarray}
    K_t &=& [{^1K_t, ^2K_t,\ldots, ^mK_t}]^T \in \mathbb{R}^m, \qquad t = 1,2,\ldots,M, \nonumber \\
    {^if_{j_1 j_2\ldots j_M}} &=& \frac{\partial^M{^if(z)}}{\partial^{j1}z\partial^{j2}z\ldots\partial^{jM}z},
    \end{eqnarray}
    }
    

    The result that I get is this

    I'd like to make the sapce there smaller, or to write {^2K_t} in another away.

    PS how can I remove the unwanted space here

    • Svend Tveskæg
      Svend Tveskæg almost 10 years
      On the left side of what? You need to be way more specific in your question.
    • Victor
      Victor almost 10 years
      on the left side of K as if you'd write K^2 but the 2 has to be on the elft side
    • Johannes_B
      Johannes_B almost 10 years
      Can you add a little code example (MWE) to clarify what you want? If you are looking for something like chemical formulas, have a look at chemmacros or mhchem
    • Jake
      Jake almost 10 years
      @Fizunik: You can eliminate the space using \!. So in this case, you could say $^2\!K$. Is that what you mean?
    • Victor
      Victor almost 10 years
      @Jake, yes it worked, tyvm
    • someonr
      someonr almost 10 years
      Th space is there because of the italic of variables in the math mode. $^2$K or $^2\mathrm{K}$ don't have the space.
    • Victor
      Victor almost 10 years
      and this is the code \begin{eqnarray} K_t &=& [{^1\!K_t, ^2\!K_t,\ldots, ^m\!K_t}]^T \in \mathbb{R}^m, \qquad t = 1,2,\ldots,M, \end{eqnarray}
    • Johannes_B
      Johannes_B almost 10 years
      Please use align over eqnarray. See: texblog.net/latex-archive/maths/eqnarray-align-environment
    • someonr
      someonr almost 10 years
      @Fizunik Please add the example code to the question (with code blocks). Even better create a MWE
    • Chris Chudzicki
      Chris Chudzicki almost 10 years
      You might also like the fouridx package, especially if you ever want an index on the left of a large symbol.
    • Svend Tveskæg
      Svend Tveskæg almost 10 years
      ... or \sideset if it is a large operator.
    • barbara beeton
      barbara beeton almost 10 years