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 "Computing with text-graphic forms"):
  Abstract: Computing with text-graphic forms  occurs when text-graphic patterns are used to direct the processing of other text-graphic patterns. The PAM graphics system was designed for just this kind of computation; PAM stands for  PA ttern  M anipulating—PAM is a generalization of LISP (McCarthy [0]) from computing with (textual) symbolic expressions to computing with text-graphic forms.   Like LISP, PAM acheives processing power by providing atomic objects, means of structuring them into complex objects and taking them apart, and equality tests for objects.  Text-graphic engines  can then be defined, allowing text editors, text-graphic editors, circuit design aids and visual language processors to all be developed in the same LISP-like environment. Examples discussed in the paper are:   handPAM is an agile environment for the  manual  manipulation of text-graphic objects (described briefly).   writtenPAM provides programmatic manipulation of visual objects.  Pattern processing  is demonstrated by functions which translate a LISP sexpr to the visual name-shape synonyms of the OUTLINE notation system, and then spatially lay it out. writtenPAM also permits definition of  pattern evaluating , enabling actual  computation  with text-graphic forms. An  evaluate  function for text-graphic objects is given which can execute OUTLINE expressions.   An experimental version of the PAM system has been implemented in MACLISP at the Stanford Artificial Intelligence Lab.

Includes members:
  Member "A structure from manipulation for text-graphic objects":
    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