Math & Science ⇒ Font Size in Equation

[perobce]

I have this equation:

Code: Select all

\begin{equation}
a = min \left\{ \begin{array}{ll}
2b\\
\frac{100}{b\cdot a}+c
\end{array}\right.
\label{enacba36}
\end{equation}

As you can see in the attachment font in expression 100/(b*a) is decreased. I wonder what to do, that font in this expression will be normal sized.

[localghost]

Such case differentiations are better typeset with an appropriate environment. The mathtools package offers corresponding structures.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}   % loads »amsmath«

\begin{document}
  \begin{equation}\label{enacba36}
    a = \min
    \begin{dcases}
      2b \\
      \frac{100}{b\cdot a}+c
    \end{dcases}
  \end{equation}
\end{document}

For details refer to the package manual. The cases package also enhances the cases environment originally provided by the amsmath package.


Best regards and welcome to the board
Thorsten