\BOOKMARK [2][]{Outline0.1}{Serge Lang}{} \BOOKMARK [2][]{Outline0.2}{Open Source Math Software}{} \BOOKMARK [2][]{Outline0.3}{How SAGE Works}{} \BOOKMARK [2][]{Outline0.4}{Demo: The Birch and Swinnerton-Dyer Conjecture}{} \BOOKMARK [2][]{Outline0.5}{History and Goals}{}