Groupprops, The Group Properties Wiki (beta)

Abstraction: Collaborative reference wiki for group theory properties

Key points:

• Maintained by Vipul Naik, a University of Chicago math PhD; part of a broader subject wikis initiative
• Over 8000 articles covering basic through advanced group theory material
• Covers detailed pages for specific groups: S3, S4, S5, D8, quaternion group, A4, A5 with subgroups, elements, and representations
• Guided tour for beginners covers definitions of groups, subgroups, cosets, Lagrange's theorem
• Searchable and browsable with site-specific search shortcuts

Connections: Group Theory · Abstract Algebra

Source: http://groupprops.subwiki.org/wiki/Main_Page