Association for the study of the theory of transformation groups and related topics. Members, news, events, publications.

Article by Steven H. Cullinane. Defines "Cartesian" coordinate systems for small finite geometries over the two-element field, and discusses geometrically simple generators for affine group actions.

Software (Magnus), preprints, meetings, links. Magnus - a graphically-oriented system for computational group theory - allows one to explore and experiment with abstract groups without the need for learning yet another programming language. Magnus is freely available software (GPL) based on Tcl/Tk.

The main point group symmetries of interest to defect physics by operation (reflection, rotations etc) and classification (trigonal, and cubic). Most point groups also have the associated character table on-line.

Computer calculation of the mod-2 cohomology of groups of order 8, 16, 32 and 64.

A fairly easy to understand tutorial. Fourteen sections, including groups, Cayley tables, subgroups, cosets, Lagrange's theorem, cyclic groups and subgroups, permutations, and Rubik's cube.

Web-based resources for permutation groups and related areas in group theory and combinatorics.

A worksheet by W.D. Joyner.

Group theory section of the mathematics e-print arXiv.

Part of the Magnus project. Contains over 150 problems in group theory, both well known and relatively new.