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: "Threader: a constraint-based verifier for multi-threaded programs"
  Abstract: We present a tool that implements Owicki-Gries and relyguarantee methods for the compositional verification of multithreaded programs. Our tool computes the requisite auxiliary assertions automatically using an abstraction and refinement procedure. Our procedure is based on a Horn clause encoding of refinement queries and facilitates the discovery of thread-modular proofs when such proofs exist. We present the tool and its evaluation on a collection of benchmarks, including a direct comparison of the effectiveness of the proof rules.

Connected through hyperedge HE-1 (induced by source paper "A study of the internal and external effects of concurrency bugs"):
  with members:
    - "Practical Byzantine fault tolerance"

Connected through hyperedge HE-2 (induced by source paper "From Traces to Proofs: Proving Concurrent Programs Safe"):
  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