In my document with a font size of 6pt, bold text isn't typeset correctly. The text gets only bold, when I change the size to 8pt, which is not my desired format. Is there any solution or workaround to this problem?

Here is a minimal working example:

\documentclass[a4paper, 6pt, landscape]{scrartcl}

\usepackage[german]{babel} %choose your language
\usepackage[landscape, margin=1cm]{geometry}
\usepackage{amscd, amsmath, amssymb, blindtext, empheq, enumitem, multicol, parskip}
    Not Bold\\
    $Not Bold$
  • 3
    Please note that \large doesn't take an argument, instead it is a switch and should be used inside a group like this: {\large Not Bold}. Also note that german is using the old German orthography, nowadays one should use ngerman instead. – Skillmon Dec 27 '19 at 20:59
  • 1
    The cmbright package is the culprit. Don't load it unless you (a) absolutely need it and (b) know what you're doing. – Mico Dec 27 '19 at 21:02
  • 2
    Also one shouldn't use \bf and if one uses it, it is a switch like \large and doesn't take an argument. Instead you could use \mathbf (which takes an argument) in maths. – Skillmon Dec 27 '19 at 21:05
  • @Mico I'd like the text to be in the computer modern font, so the package is essential for that, isn't it? – Juan Dec 27 '19 at 21:09
  • 1
    @Juan no, Computer Modern is the default font in TeX, cmbright is not Computer Modern, but Computer Modern Bright, which is a sans-serif typeface based on Computer Modern. To use Computer Modern, just don't use any font packages. – Skillmon Dec 27 '19 at 21:10

It is by design. cmbright substitutes the normal font for fontsizes below 9pt. If you switch to T1-encoding (which is better anyway) you will get semi bold:

\documentclass[a4paper, 6pt, landscape]{scrartcl}
    Not Bold\\

enter image description here

Side remark: 6pt font is a pain for readers. So better avoid it ...

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