[Tex/LaTex] Poster and (very) bold math fonts

beamerboldfontsposters

I've spent several hours to put some mathematical laws for powers and logarithm on a poster.

The output is too thin for reading it standing a few meters away, especially sitting in a classroom in the last row.

I have to use a bold font for math, but I don't find any solution. 

\documentclass[final]{beamer} % beamer 3.10: do NOT use option hyperref={pdfpagelabels=false} !
  \mode<presentation> {  
    \usetheme{default}   
  }
  \usepackage[english]{babel}
  \usepackage[latin1]{inputenc}
  \usepackage{amsmath,amsthm, amssymb, latexsym}
  %\usepackage{times}\usefonttheme{professionalfonts}  % times is obsolete
  \usefonttheme[onlymath]{serif}
  \boldmath
  \usepackage[orientation=portrait,size=a1,scale=2.4,debug]{beamerposter}                       % e.g. for DIN-A0 poster
  \title[]{Potenz- und Logarithmengesetze}
  \begin{document}
  \begin{frame}{} 
    \vfill
   \begin{block}{\Huge\hspace{2cm} Potenzgesetze}
\[\def\arraystretch{2}\begin{array}{rclp{5cm}} 
    a^m \cdot a^m & = &a^{m+n} &\\
\displaystyle \frac{a^m}{a^n} & =& a^{m-n} \\
    (a \cdot b)^m & =& a^m \cdot b^m \\
    \displaystyle \left(\frac{a}{b}\right)^m & = & \displaystyle \frac{a^m}{b^m} \\
    \bigl( a^m \bigr)^n & =& a^{m \cdot n} \\
      \end{array}
        \]
\end{block}
\vfill 
\begin{block}{\Huge\hspace{2cm} Logarithmengesetze}
        \[ \def\arraystretch{2}\begin{array}{rcl}
        \ln(a \cdot b) & = &\ln(a) + \ln(b) \\
        \displaystyle \ln\left( \frac{a}{b} \right) & = &\ln(a) - \ln(b) \\
        \ln(a^b) & =& b \cdot \ln(a) \\
        \ln(e)   & = &1 \\
        \ln(1)   & = &0 \\
        \ln(e^x) & = &e^{\ln(x)} = x 
        \end{array}\]
\end{block}
    \vfill
  \end{frame}
  \end{document}

That is one of my attemps. No luck.

Any help is appreciated!

Best Answer

Why not increasing the size of the font in the arrays?

Use for example \large before \begin{array} and adjust the spacing before it (I've used \vspace*{-3cm}).

MWE:

\documentclass[final]{beamer} % beamer 3.10: do NOT use option hyperref={pdfpagelabels=false} !
  \mode<presentation> {
    \usetheme{default}
  }
  \usepackage[english]{babel}
  \usepackage[latin1]{inputenc}
  \usepackage{amsmath,amsthm, amssymb, latexsym}
  %\usepackage{times}\usefonttheme{professionalfonts}  % times is obsolete
  \usefonttheme[onlymath]{serif}
  \boldmath
  \usepackage[orientation=portrait,size=a1,scale=2.4,debug]{beamerposter}                       % e.g. for DIN-A0 poster
  \title[]{Potenz- und Logarithmengesetze}

  \begin{document}
  \begin{frame}{}
    \vfill
   \begin{block}{\Huge\hspace{2cm} Potenzgesetze}\vspace*{-3cm}
\[\def\arraystretch{2}\large\begin{array}{rclp{5cm}}
    a^m \cdot a^m & = &a^{m+n} &\\
\displaystyle \frac{a^m}{a^n} & =& a^{m-n} \\
    (a \cdot b)^m & =& a^m \cdot b^m \\
    \displaystyle \left(\frac{a}{b}\right)^m & = & \displaystyle \frac{a^m}{b^m} \\
    \bigl( a^m \bigr)^n & =& a^{m \cdot n} \\
      \end{array}
        \]
\end{block}
\vfill
\begin{block}{\Huge\hspace{2cm} Logarithmengesetze}\vspace*{-3cm}
        \[ \def\arraystretch{2}\large\begin{array}{rcl}
        \ln(a \cdot b) & = &\ln(a) + \ln(b) \\
        \displaystyle \ln\left( \frac{a}{b} \right) & = &\ln(a) - \ln(b) \\
        \ln(a^b) & =& b \cdot \ln(a) \\
        \ln(e)   & = &1 \\
        \ln(1)   & = &0 \\
        \ln(e^x) & = &e^{\ln(x)} = x
        \end{array}\]
\end{block}
    \vfill
  \end{frame}
  \end{document}

Output:

enter image description here

Related Question