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 "Orthopairs: A Simple and Widely UsedWay to Model Uncertainty"):
  Abstract: The term orthopair is introduced to group under a unique definition different ways used to denote the same concept. Some orthopair models dealing with uncertainty are analyzed both from a mathematical and semantical point of view, outlining similarities and differences among them. Finally, lattice operations on orthopairs are studied and a survey on algebraic structures is provided.

Includes members:
  Member "Truth-Functionality, Rough Sets and Three-Valued Logics":
    also connected through other hyperedges:
      (none)
  Member "Generalized Orthopair Fuzzy Sets":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Some q-Rung Dual Hesitant Fuzzy Heronian Mean Operators with Their Application to Multiple Attribute Group Decision-Making")

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