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: "Explaining ambiguity in a formal query language"
  Abstract: The problem of generating reasonable natural language-like responses to queries formulated in nonnavigational query languages with logical data independence is addressed. An extended ER model, the Entity-Relationship-Involvement model, is defined which assists in providing a greater degree of logical data independence and the generation of natural language explanations of a query processor's interpretation of a query. These are accomplished with the addition of the concept of an involvement to the model. Based on involvement definitions in a formally defined data definition language, DDL, an innovative strategy for generating explanations is outlined and exemplified. In the conclusion, possible extensions to the approach are given.

Connected through hyperedge HE-1 (induced by source paper "Query by example"):
  with members:
    - "Theseus—a programming language for relational databeses"
    - "Spatial management of data"
    - "Human Factors Studies of Database Query Languages: A Survey and Assessment"
    - "Query-by-example: the invocation and definition of tables and forms"
    - "Combining keyword search and forms for ad hoc querying of databases"
    - "QBE/OBE: A Language for Office and Business Automation"
    - "Relational database: a practical foundation for productivity"

Connected through hyperedge HE-2 (induced by source paper "AUTOJOIN: PROVIDING FREEDOM FROM SPECIFYING JOINS"):
  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: Computer science