2

I have the following equation (I use MathType and then exctract it in LaTeX):

\begin{equation}
\begin{array}{*{20}{c}}
{\begin{array}{*{20}{l}}
{{\textrm{Dot product:}}}&{{\rm{            }}{\sigma _{ij}}{n_j} \Leftrightarrow {\bf{\sigma n}}}
\end{array}}\\
{\begin{array}{*{20}{c}}
{{\textrm{Double dot product:}}}&{\left\{ \begin{array}{l}
{L_{ijkl}}{\varepsilon _{kl}} = {\bf{L\varepsilon }}\\
{L_{ijkl}}{T_{klpq}} = {\bf{LT}}
\end{array} \right.}
\end{array}}
\end{array}
\end{equation}

which produces

enter image description here

How is it possible to align the text in the left?

Thanks

5

MathType is not really doing a good work: it's much simpler to type in LaTeX directly.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation}
\begin{alignedat}{2}
&\text{Dot product:}        &\quad& \sigma_{ij}{n_j} = \sigma\mathbf{n} \\
&\text{Double dot product:} &\quad&
  \begin{cases}
  L_{ijkl}\varepsilon_{kl} = \mathbf{L}\varepsilon \\
  L_{ijkl}T_{klpq} = \mathbf{L}\mathbf{T}
  \end{cases}
\end{alignedat}
\end{equation}

\end{document}

enter image description here

2

This answer is similar to the one by Enrico, but is using aligned instead of alignedat.

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{equation}
  \begin{aligned}
    & \textrm{Dot product:} && \sigma_{ij} n_j \Leftrightarrow \mathbf{\sigma n} \\
    & \textrm{Double dot product:} &&
    \begin{cases}
      L_{ijkl} \varepsilon_{kl} = \mathbf{L\varepsilon} \\
      L_{ijkl} T_{klpq} = \mathbf{LT}
    \end{cases}
  \end{aligned}
\end{equation}
\end{document}

enter image description here

  • I guess I will receive many answers. Indeed MathType does not do do a good job at all! Thank you very much. – Dimitris Nov 17 '15 at 10:55
2

Here is a much simpler code with alignedat and cases environments. Use the bm package to have bold Greek letters.You don't need all those pairs of { }. Also note font commands such as \rm,\bf`, &c. shouldn't be used as they're plain TeX commands, and they don't work well w.r.t. New Font Selection Scheme (N.F.S.S.) which has been new for more than 20 years…

\documentclass{amsart}
\usepackage{amsmath, bm}

\begin{document}

\begin{equation}
  \begin{alignedat}{2}
    & \textrm{Dot product:}&&\quad\sigma _{ij}n_j\Leftrightarrow \bm{\sigma}\mathbf{n}\\
    & \textrm{Double dot product:} &\enspaAce & \begin{cases}
    L_{ijkl}\varepsilon _{kl} = \mathbf{L}\bm{\varepsilon }\\
    L_{ijkl}T_{klpq} = \mathbf{LT}
    \end{cases}
  \end{alignedat}
\end{equation}

\end{document} 

enter image description here

  • Why do you include amssymb and amsfonts? As far as I can see you do not use their functionality in the example. – Henri Menke Nov 17 '15 at 15:26
  • @Henry Lenke: You're right. I simply use the preamble of an answer to a previous question. Actually, in a first version of my answer, I used boldsymbol instead of \bm to bolden Greek letters. Thanks for pointing the confusing preamble. – Bernard Nov 17 '15 at 16:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.