human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Groups of dimension two and three over o-minimal structures"
  Abstract: Abstract   Let  G  be a group definable in an o-minimal structure  M . In this paper we show:  Theorem . If  G  is a two-dimensional definably connected nonabelian group, then  G  is centerless and  G  is isomorphic to  R  + ⋊ R  ∗  >  0 , for some real closed field  R .  Theorem . If  G  is a three-dimensional nonsolvable, centerless, definably connected group, then either  G  ≅ SO 3 ( R ) or  G  ≅ PSL 2 ( R ), for some real closed field  R .

Connected through hyperedge HE-1 (induced by source paper "One-dimensional groups over an o-minimal structure"):
  with members:
    (none)

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Mathematics