\BOOKMARK [1][-]{section.1}{Announcements}{}% 1
\BOOKMARK [1][-]{section.2}{Math formulas}{}% 2
\BOOKMARK [2][-]{subsection.2.1}{Some basics}{section.2}% 3
\BOOKMARK [2][-]{subsection.2.2}{Using Sage}{section.2}% 4
\BOOKMARK [2][-]{subsection.2.3}{Use Some random webpage}{section.2}% 5
\BOOKMARK [1][-]{section.3}{Sectioning and cross referencing}{}% 6
\BOOKMARK [1][-]{section.4}{Including graphics}{}% 7