\BOOKMARK [0][-]{chapter.1}{Introduction}{}% 1
\BOOKMARK [0][-]{chapter.2}{2d-groups : crossed modules and cat1-groups}{}% 2
\BOOKMARK [1][-]{section.2.1}{Constructions for crossed modules}{chapter.2}% 3
\BOOKMARK [1][-]{section.2.2}{Pre-crossed modules}{chapter.2}% 4
\BOOKMARK [1][-]{section.2.3}{Cat1-groups and pre-cat1-groups}{chapter.2}% 5
\BOOKMARK [1][-]{section.2.4}{Selection of a small cat1-group}{chapter.2}% 6
\BOOKMARK [0][-]{chapter.3}{2d-mappings}{}% 7
\BOOKMARK [1][-]{section.3.1}{Morphisms of 2d-groups}{chapter.3}% 8
\BOOKMARK [1][-]{section.3.2}{Morphisms of pre-crossed modules}{chapter.3}% 9
\BOOKMARK [1][-]{section.3.3}{Morphisms of pre-cat1-groups}{chapter.3}% 10
\BOOKMARK [1][-]{section.3.4}{Operations on morphisms}{chapter.3}% 11
\BOOKMARK [0][-]{chapter.4}{Derivations and Sections}{}% 12
\BOOKMARK [1][-]{section.4.1}{Whitehead Multiplication}{chapter.4}% 13
\BOOKMARK [1][-]{section.4.2}{Whitehead Groups and Monoids}{chapter.4}% 14
\BOOKMARK [0][-]{chapter.5}{Actors of 2d-groups}{}% 15
\BOOKMARK [1][-]{section.5.1}{Actor of a crossed module}{chapter.5}% 16
\BOOKMARK [0][-]{chapter.6}{Induced Constructions}{}% 17
\BOOKMARK [1][-]{section.6.1}{Induced crossed modules}{chapter.6}% 18
\BOOKMARK [0][-]{chapter.7}{Crossed squares and their morphisms}{}% 19
\BOOKMARK [1][-]{section.7.1}{Constructions for crossed squares}{chapter.7}% 20
\BOOKMARK [1][-]{section.7.2}{Morphisms of crossed squares}{chapter.7}% 21
\BOOKMARK [0][-]{chapter.8}{Crossed modules of groupoids}{}% 22
\BOOKMARK [1][-]{section.8.1}{Constructions for crossed modules of groupoids}{chapter.8}% 23
\BOOKMARK [0][-]{chapter.9}{Utility functions}{}% 24
\BOOKMARK [1][-]{section.9.1}{Printing Lists}{chapter.9}% 25
\BOOKMARK [1][-]{section.9.2}{Inclusion and Restriction Mappings}{chapter.9}% 26
\BOOKMARK [1][-]{section.9.3}{Abelian Modules}{chapter.9}% 27
\BOOKMARK [1][-]{section.9.4}{Distinct and Common Representatives}{chapter.9}% 28
\BOOKMARK [0][-]{chapter.10}{Development history}{}% 29
\BOOKMARK [1][-]{section.10.1}{Changes from version to version}{chapter.10}% 30
\BOOKMARK [1][-]{section.10.2}{Versions for GAP 4.5, 4.6 and 4.7}{chapter.10}% 31
\BOOKMARK [1][-]{section.10.3}{What needs doing next?}{chapter.10}% 32
\BOOKMARK [0][-]{chapter*.5}{References}{}% 33
\BOOKMARK [0][-]{section*.6}{Index}{}% 34
