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: "TypEr : a type annotator of Erlang code"
  Abstract: We describe and document the techniques used in TOOL, a fully automatic type annotator for Erlang programs based on constraint-based type inference of  success typings  (a notion closely related to principal typings). The inferred typings are fine-grained and the type system currently includes subtyping and subtype polymorphism but not parametric polymorphism. In particular, we describe and illustrate through examples a type inference algorithm tailored to Erlang's characteristics which is modular, reasonably fast, and appears to scale well in practice.

Connected through hyperedge HE-1 (induced by source paper "Automatic Inference of Erlang Module Behaviour"):
  with members:
    (none)

Connected through hyperedge HE-2 (induced by source paper "Detecting Software Defects in Telecom Applications Through Lightweight Static Analysis: A War Story"):
  with members:
    - "A practical soft type system for scheme"

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