human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "edge intersection graphs of l shaped paths in grids"
  Abstract: In this paper we continue the study of the edge intersection graphs of one (or zero) bend paths on a rectangular grid. That is, the edge intersection graphs where each vertex is represented by one of the following shapes: źź , ź , źs , ź , and we consider zero bend paths (i.e., ź and-) to be degenerate źź 's. These graphs, called B 1 -EPG graphs, were first introduced by Golumbic etźal. (2009). We consider the natural subclasses of B 1 -EPG formed by the subsets of the four single bend shapes (i.e., { źź } , { źź , ź } , { źź , ź } , and { źź , ź , ź } ) and we denote the classes by źź , źź , ź , źź , ź , and źź , ź , ź respectively. Note: all other subsets are isomorphic to these up to 90 degree rotation. We show that testing for membership in each of these classes is NP-complete and observe the expected strict inclusions and incomparability (i.e., źź ź źź , ź , źź , ź ź źź , ź , ź ź B 1 -EPG and źź , ź is incomparable with źź , ź ). Additionally, we give characterizations and polytime recognition algorithms for special subclasses of Split ź ź źź .

Connected through hyperedge HE-1 (induced by source paper "the complexity of helly b 1 epg graph recognition"):
  with members:
    - "on edge intersection graphs of paths with 2 bends"
    - "minimum weight triangulation is np hard"

Connected through hyperedge HE-2 (induced by source paper "computing maximum cliques in b_2 epg graphs"):
  with members:
    - "on edge intersection graphs of paths with 2 bends"
    - "on independent set on b1 epg graphs"
    - "the maximum clique problem in multiple interval graphs"

Connected through hyperedge HE-3 (induced by source paper "on edge intersection graphs of paths with 2 bends"):
  with members:
    - "bend bounded path intersection graphs sausages noodles and waffles on a grill"
    - "the maximum clique problem in multiple interval graphs"

Connected through hyperedge HE-4 (induced by source paper "on independent set on b1 epg graphs"):
  with members:
    - "approximation algorithms for maximum independent set of pseudo disks"
    - "the maximum clique problem in multiple interval graphs"

Connected through hyperedge HE-5 (induced by source paper "graphs of edge intersecting non splitting paths in a tree representations of holes part ii"):
  with members:
    - "characterizing path graphs by forbidden induced subgraphs"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DM(Discrete Mathematics)