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 flexible graph pattern matching framework via indexing"
  Abstract: In recent years, pattern matching has been an important graph analysis tool in various applications. In previous existing models, each edge in the query pattern represents the same relationship, e.g., the two endpoint vertices have to be connected or the distance between them should be within a certain uniform threshold. However, various real world applications may require edges representing different relationships or distances, some may be longer while others may be shorter. Therefore, we introduce the flexible pattern matching model where a range [mine, maxe] is associated with an edge e in the query pattern, which means that the minimum distance between the matched endpoints of e is in the range of [mine,maxe]. A novel pattern matching algorithm utilizing two types of indices is devised. In addition to the traditional pattern matching scheme, a top-k matches generation model is also proposed. Extensive empirical studies have been conducted to show the effectiveness and efficiency of our indices and methods.

Connected through hyperedge HE-1 (induced by source paper "Fast Graph Pattern Matching"):
  with members:
    - "Query optimization"
    - "Efficient subgraph matching on billion node graphs"
    - "PEGASUS: A Peta-Scale Graph Mining System Implementation and Observations"

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