Problem of the Week
BUGCAT
Zassenhaus Conference
Hilton Memorial Lecture
BingAWM
Math Club
The point of this talk is to illustrate the interplay of combinatorial and topological methods in combinatorial problems. I will consider a combinatorial problem (a 4-fan partition of 2 masses), its transformation into a topological problem on subspace arrangements, and the combinatorial and equivariant cohomology techniques in the solution of this problem.