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: "One-dimensional groups over an o-minimal structure"
  Abstract: Abstract   In this paper we prove the following theorem: Any one-dimensional definably connected group  G  over an o-minimal structure is, as an abstract group, isomorphic to either ⊕ p ∈ P    Z    p ∞⊕⊕δ    Q    or ⊕δ    Q

Connected through hyperedge HE-1 (induced by source paper "Groups of dimension two and three over o-minimal structures"):
  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