test.tex

   1 \documentclass[a4paper,leqno]{strayman}
   2 \let\numberwithin=\notdef
   3 \usepackage{txfonts}
   4 \begin{document}
   5 ${\varmathbb Q}$
   6 \section{Section}
   7 \subsection{Subsection $\varmathbb P$ breaks}
   8 body
   9 \end{document}