Abstract: The Mobius number of a group, G, is a topological invariant that can tell you something about the structure of G. The most interesting cases are when G is simple or almost simple. I will talk about some recent computational work that has extended current databases and talk about a conjecture that might extend them even further. I am giving a shorter version of this talk at the Graduate Students Combinatorics Conference this weekend so this probably will not last the entire hour.

This is the talk that was postponed last week.