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: "A knowledge-based application definition system"
  Abstract: The design of an experimental consultation system, here called ADS, aimed at providing expert-level assistance to (nonprogrammer) specialists in defining medically-oriented, sensor-based applications is considered. The heart of the system is a knowledge base containing extensive static descriptions of the problem domain and mechanisms for instantiating elements of a subject application.

Connected through hyperedge HE-1 (induced by source paper "An overview of KRL, a Knowledge Representation Language"):
  with members:
    - "BORIS -- An Experiment in In-Depth Understanding of Narratives."
    - "MULTI - a LISP based multiprocessing system"
    - "The tractability of subsumption in frame-based description languages"
    - "GUS, a frame-driven dialog system"
    - "Six topics in search of a parser: an overview of AI language research"
    - "The Programming Language Aspects of ThingLab, a Constraint-Oriented Simulation Laboratory"
    - "The prolog phenomenon"

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: Computer science