human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "Towards imperative modules: reasoning about invariants and sharing of mutable state"):
  Abstract: Imperative and object-oriented programs make ubiquitous use of shared mutable objects. Updating a shared object can and often does transgress a boundary that was supposed to be established using static constructs such as a class with private fields. This paper shows how auxiliary fields can be used to express two state-dependent encapsulation disciplines: ownership, a kind of separation, and local co-dependence, a kind of sharing. A methodology is given for specification and modular verification of encapsulated object invariants and shown sound for a class-based language.

Includes members:
  Member "Separation and information hiding":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "A local shape analysis based on separation logic")

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science