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: "Max point-tolerance graphs"
  Abstract: Abstract   A graph    G    is a  max point-tolerance (MPT)  graph if each vertex    v    of    G    can be mapped to a  pointed-interval     (    I    v    ,    p    v    )     where      I    v      is an interval of    R    and      p    v    ∈    I    v      such that    u  v    is an edge of    G    iff      I    u    ∩    I    v    ⊇   {    p    u    ,    p    v    }    . MPT graphs model relationships among DNA fragments in genome-wide association studies as well as basic transmission problems in telecommunications. We formally introduce this graph class, characterize it, study combinatorial optimization problems on it, and relate it to several well known graph classes. We characterize MPT graphs as a special case of several 2D geometric intersection graphs; namely, triangle, rectangle, L-shape, and line segment intersection graphs. We further characterize MPT as having certain linear orders on their vertex set. Our last characterization is that MPT graphs are precisely obtained by intersecting special pairs of interval graphs. We also show that, on MPT graphs, the maximum weight independent set problem can be solved in polynomial time, the coloring problem is NP-complete, and the clique cover problem has a 2-approximation. Finally, we demonstrate several connections to known graph classes; e.g., MPT graphs strictly contain interval graphs and outerplanar graphs, but are incomparable to permutation, chordal, and planar graphs.

Connected through hyperedge HE-1 (induced by source paper "Approximating hitting sets of axis-parallel rectangles intersecting a monotone curve"):
  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: Mathematics