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: "detecting induced subgraphs"
  Abstract: An s-graph is a graph with two kinds of edges: subdivisible edges and real edges. A realisation of an s-graph B is any graph obtained by subdividing subdivisible edges of B into paths of arbitrary length (at least one). Given an s-graph B, we study the decision problem @P"B whose instance is a graph G and question is ''Does G contain a realisation of B as an induced subgraph?''. For several B's, the complexity of @P"B is known and here we give the complexity for several more. Our NP-completeness proofs for @P"B's rely on the NP-completeness proof of the following problem. Let S be a set of graphs and d be an integer. Let @C"S^d be the problem whose instance is (G,x,y) where G is a graph whose maximum degree is at most d, with no induced subgraph in S and x,y@?V(G) are two non-adjacent vertices of degree 2. The question is ''Does G contain an induced cycle passing through x,y?''. Among several results, we prove that @C"0"@?^3 is NP-complete. We give a simple criterion on a connected graph H to decide whether @C"{"H"}^+^~ is polynomial or NP-complete. The polynomial cases rely on the algorithm three-in-a-tree, due to Chudnovsky and Seymour.

Connected through hyperedge HE-1 (induced by source paper "three in a tree in near linear time"):
  with members:
    - "graph pattern detection hardness for all induced patterns and faster non induced cycles"
    - "a faster algorithm to recognize even hole free graphs"
    - "on the structure of pan even hole free graphs"
    - "powers of tensors and fast matrix multiplication"
    - "detecting an induced net subdivision"
    - "large induced subgraphs via triangulations and cmso"
    - "induced disjoint paths in claw free graphs"
    - "detecting 2 joins faster"

Connected through hyperedge HE-2 (induced by source paper "detecting induced subdivision of k 4"):
  with members:
    - "chromatic number of isk4 free graphs"
    - "detecting an induced net subdivision"

Connected through hyperedge HE-3 (induced by source paper "induced disjoint paths in claw free graphs"):
  with members:
    - "the k in a path problem for claw free graphs"
    - "domination when the stars are out"
    - "finding topological subgraphs is fixed parameter tractable"
    - "the k in a tree problem for graphs of girth at least k"
    - "the four in a tree problem in triangle free graphs"

Connected through hyperedge HE-4 (induced by source paper "the k in a path problem for claw free graphs"):
  with members:
    - "the k in a tree problem for graphs of girth at least k"
    - "the four in a tree problem in triangle free graphs"

Connected through hyperedge HE-5 (induced by source paper "graphs that do not contain a cycle with a node that has at least two neighbors on it"):
  with members:
    - "edge colouring and total colouring chordless graphs"
    - "algorithms for perfectly contractile graphs"

Connected through hyperedge HE-6 (induced by source paper "the k in a tree problem for graphs of girth at least k"):
  with members:
    - "the four in a tree problem in triangle free graphs"

Connected through hyperedge HE-7 (induced by source paper "the four in a tree problem in triangle free graphs"):
  with members:
    - "algorithms for square 3pc cdot cdot free berge graphs"

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)