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 "Class-Based versus Object-Based: A Denotational Comparison"):
  Abstract: In object-oriented programming one distinguishes two kinds of languages. Class-based languages are centered around the concept of classes as descriptions of objects. In object-based languages the concept of a class is substituted by constructs for the creation of individual objects. Usually, the object-based languages attract interest because of their "simplicity". This paper contains a thorough denotational analysis which reveals that simplicity is quickly lost if one tackles verification issues. This is due to what is sometimes called "recursion through the store". By providing a denotational semantics for a simple class-based and a simple object-based language it is shown that the denotational semantics of the object-based language needs much more advanced domain theoretic machinery than the class based one. The gap becomes even wider when we define concepts of specification and appropriate verification rules.

Includes members:
  Member "Semantics and logic of object calculi":
    also connected through other hyperedges:
      (none)

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