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: "Review Article: Recent Advances in Artificial Immune Systems: Models and Applications"
  Abstract: The immune system is a remarkable information processing and self learning system that offers inspiration to build artificial immune system (AIS). The field of AIS has obtained a significant degree of success as a branch of Computational Intelligence since it emerged in the 1990s. This paper surveys the major works in the AIS field, in particular, it explores up-to-date advances in applied AIS during the last few years. This survey has revealed that recent research is centered on four major AIS algorithms: (1) negative selection algorithms; (2) artificial immune networks; (3) clonal selection algorithms; (4) Danger Theory and dendritic cell algorithms. However, other aspects of the biological immune system are motivating computer scientists and engineers to develop new models and problem solving methods. Though an extensive amount of AIS applications has been developed, the success of these applications is still limited by the lack of any exemplars that really stand out as killer AIS applications.

Connected through hyperedge HE-1 (induced by source paper "An AIS-based hybrid algorithm for static job shop scheduling problem"):
  with members:
    - "A hybrid particle swarm optimization with local search for stochastic resource allocation problem"

Connected through hyperedge HE-2 (induced by source paper "Is negative selection appropriate for anomaly detection"):
  with members:
    - "Coverage and generalization in an artificial immune system"
    - "Emphasizing typing signature in keystroke dynamics using immune algorithms"

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