Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4653592 | European Journal of Combinatorics | 2014 | 11 Pages |
Using combinatorial techniques, we answer two questions about simple classical Lie groups. Define N(G,m)N(G,m) to be the number of conjugacy classes of elements of finite order mm in a Lie group GG, and N(G,m,s)N(G,m,s) to be the number of such classes whose elements have ss distinct eigenvalues or conjugate pairs of eigenvalues. What is N(G,m)N(G,m) for GG a unitary, orthogonal, or symplectic group? What is N(G,m,s)N(G,m,s) for these groups? For some cases, the first question was answered a few decades ago via group-theoretic techniques. It appears that the second question has not been asked before; here it is inspired by questions related to enumeration of vacua in string theory. Our combinatorial methods allow us to answer both questions.