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 "Set comparisons in a general domain: the Indirect Utility Criterion"):
  Abstract: Abstract   The problem of extending a preference relation on a set to its power set is considered. We interpret the classical Indirect Utility Criterion as the extreme opposite, in terms of freedom of choice considerations, of the well-known Cardinality-based Criterion introduced by Pattanaik and Xu, 1990. This paper proposes axiomatic characterizations for suitable extensions of the Indirect Utility Criterion when the basic set of alternatives is uncountable and the preference over this set allows for a continuous utility representation.

Includes members:
  Member "Freedom of choice: the leximax criterion in the infinite case":
    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