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: "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.

Connected through hyperedge HE-1 (induced by source paper "A structure from manipulation for text-graphic objects"):
  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