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: "Ovals and Hyperovals in Desarguesian Nets"
  Abstract: We determine the Desarguesian planes which hold r-nets with ovals and those which hold r-nets with hyperovals for every r≤7.

Connected through hyperedge HE-1 (induced by source paper "The Non-Existence of Maximal Sets of Four Mutually Orthogonal Latin Squares of Order 8"):
  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