human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "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

Includes members:
  Member "Groups of dimension two and three over o-minimal structures":
    also connected through other hyperedges:
      (none)

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Mathematics