physics / midyear.auxon commit [spec] add formula for length of a parametric curve (e94ea5c)
   1\relax 
   2\@writefile{toc}{\contentsline {section}{\numberline {1}Motion}{}}
   3\@writefile{toc}{\contentsline {section}{\numberline {2}Relativity}{}}
   4\@writefile{toc}{\contentsline {section}{\numberline {3}Fields and power}{}}