Symbols – How to Write an E with a Circle Around the Middle Line

symbols

I want to type the symbol

in latex. What should I do? I guess I have to define the symbol. How to do it in latex?

Best Answer

Adjusting the 2nd and 4th arguments to \stackinset will adjust the (x,y) location of the \circ inset.

\documentclass{article}

\usepackage{stackengine}
\newcommand\Ecirc{\stackinset{r}{}{c}{-.1pt}{$\circ$}{E}}

\begin{document}

This is \Ecirc.

\end{document}

If you need it to work for different script styles in math mode, then the above approach can be adapted:

\documentclass{article}

\usepackage{stackengine,scalerel}
\newcommand\Ecirc{\ThisStyle{\stackinset{r}{}{c}{-.1pt}
  {$\SavedStyle\circ$}{$\SavedStyle\mathrm{E}$}}}

\begin{document}

This is \Ecirc{} and $x^{\Ecirc}$.

\end{document}

Related Solutions

Math Mode Symbols – How to Put Symbol Around the Equal Sign

The amsmath package provides the \overset and \underset macros that can be used to place one symbol above or below another. If you want text above and below, you could use \DeclareMathOperator* (also from amsmath).

\documentclass{minimal}
\usepackage{amsmath}
\DeclareMathOperator*{\eq}{=}
\begin{document}
\begin{equation*}
\underset{b}{=} \quad  \eq^a_b
\end{equation*}
\end{document}

There shouldn't be any problems using this in amsmath environments such as align.

\begin{align*}
A  &\eq^b_a B \\
   &\eq^b_a C
\end{align*}

However, if you use it in the middle column of an eqnarray or eqnarray* (which are generally considered to be obsolete), then you will need \displaystyle before \eq.

All of the above applies to egreg's suggestion of defining \eq via

\newcommand{\eq}[2]{\mathrel{\operatorname*{=}_#1^#2}}

which seems to improve the spacing (and may be better in other ways as well).

[Tex/LaTex] How to type tensor multiplication with vertical dots

These are obviously binary operators, so they should carry the same spacing. That is, use whatever works and then wrap it in \mathbin. While the original picture showed the bottom dots resting on the baseline, I think it would be more correct to center the symbols on the math axis (where the \cdot is placed). Here is a simple possibility, that does not allow for size changes in scripts, but does respect global size changes like \large.

\documentclass{article}

\def\onedot{$\mathsurround0pt\ldotp$}
\def\cddot{% two dots stacked vertically
  \mathbin{\vcenter{\baselineskip.67ex
    \hbox{\onedot}\hbox{\onedot}}%
  }}%
\def\cdddot#1{% three dots 
  \mathbin{\vcenter{\baselineskip.67ex
    \hbox{\onedot}\hbox{\onedot}\hbox{\onedot}%
  }}%
}

\begin{document}
Test it:
\[
\mathbf{P} = \varepsilon_0 \left(\chi^{(1)}
    \cdot \mathbf{E} + \chi^{(2)}
    \cddot \mathbf{EE} + \chi^{(3)}
    \cdddot \mathbf{EEE} + \cdots \right)
\]
\end{document}

Allowing for changes in scripts is a good deal harder, but could be done with the aid of some of the internals of the mathdots package.

Best Answer

Related Solutions

Math Mode Symbols – How to Put Symbol Around the Equal Sign

[Tex/LaTex] How to type tensor multiplication with vertical dots

Related Question