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: "Deductive databases for computing certain and consistent answers from mediated data integration systems"
  Abstract: We address the problem of retrieving certain and consistent answers to queries posed to a mediated data integration system under the local-as-view paradigm with open sources and conjunctive and disjunctive view definitions. For obtaining certain answers a query program is run under the cautious stable model semantics on top of a normal deductive database with choice operator that specifies the class of minimal legal instances of the integration system. This methodology works for all monotone Datalog queries. To compute answers to queries that are consistent with respect to given global integrity constraints, the specification of minimal legal instances is combined with another disjunctive deductive database that specifies the repairs of those legal instances. This allows to retrieve the answers to any Datalog ¬ query that are consistent with respect to global universal and referential integrity constraints.

Connected through hyperedge HE-1 (induced by source paper "Security analysis of cryptographically controlled access to XML documents"):
  with members:
    - "Reconciling Two Views of Cryptography (The Computational Soundness of Formal Encryption)"
    - "Entropy based nearest neighbor search in high dimensions"
    - "Extending decidable existential rules by joining acyclicity and guardedness"

Connected through hyperedge HE-2 (induced by source paper "Consistent query answering in databases"):
  with members:
    - "Declarative entity resolution via matching dependencies and answer set programs"

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