\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Perturbation theory}{}% 2
\BOOKMARK [1][-]{section.3}{Historical overview}{}% 3
\BOOKMARK [2][-]{subsection.3.1}{Behavior of the M\370ller-Plesset series}{section.3}% 4
\BOOKMARK [2][-]{subsection.3.2}{Cases of divergence}{section.3}% 5
\BOOKMARK [2][-]{subsection.3.3}{The singularity structure}{section.3}% 6
\BOOKMARK [2][-]{subsection.3.4}{The physics of quantum phase transition}{section.3}% 7
\BOOKMARK [1][-]{section.4}{The spherium model}{}% 8