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 "Functions operating on multivariate distribution and survival functions-With applications to classical mean-values and to copulas"):
  Abstract: Functions operating on multivariate distribution and survival functions are characterized, based on a theorem of Morillas, for which a new proof is presented. These results are applied to determine those classical mean values on [0,1]^n which are distribution functions of probability measures on [0,1]^n. As it turns out, the arithmetic mean plays a universal role for the characterization of distribution as well as survival functions. Another consequence is a far reaching generalization of Kimberling's theorem, tightly connected to Archimedean copulas.

Includes members:
  Member "Monotonicity properties of multivariate distribution and survival functions - With an application to Lévy-frailty copulas":
    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