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: "Freedom of choice: the leximax criterion in the infinite case"
  Abstract: Abstract   Many recent works have investigated the problem of extending a preference over a set of alternatives to its power set, in an attempt to provide a formal representation of the notion of freedom of choice. In general, results are limited to the finite case, which excludes, for instance, the case of economic environments. This paper deals with the possibility of extending those results to the context where the basic set of alternatives is the  n -dimensional Euclidean space. We present an extension of the leximax criterion described by Bossert et al. [J. Econ. Ther. 63 (1994) 326] to this more general framework.

Connected through hyperedge HE-1 (induced by source paper "Set comparisons in a general domain: the Indirect Utility Criterion"):
  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