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: "critical sets in bipartite graphs"
  Abstract: Let G=(V,E) be a graph. A set S is independent if no two vertices from S are adjacent, alpha(G) is the size of a maximum independent set, and core(G) is the intersection of all maximum independent sets. The number d(X)=|X|-|N(X)| is the difference of the set X, and d_{c}(G)=max{d(I):I is an independent set} is called the critical difference of G. A set X is critical if d(X)=d_{c}(G). For a graph G we define ker(G) as the intersection of all critical independent sets, while diadem(G) is the union of all critical independent sets. For a bipartite graph G=(A,B,E), with bipartition {A,B}, Ore defined delta(X)=d(X) for every subset X of A, while delta_0(A)=max{delta(X):X is a subset of A}. Similarly is defined delta_0(B). In this paper we prove that for every bipartite graph G=(A,B,E) the following assertions hold: d_{c}(G)=delta_0(A)+delta_0(B); ker(G)=core(G); |ker(G)|+|diadem(G)|=2*alpha(G).

Connected through hyperedge HE-1 (induced by source paper "on the critical difference of almost bipartite graphs"):
  with members:
    - "a set and collection lemma"
    - "on the core of a unicyclic graph"
    - "vertices belonging to all critical independent sets of a graph"
    - "a characterization of konig egervary graphs using a common property of all maximum matchings"

Connected through hyperedge HE-2 (induced by source paper "critical and maximum independent sets of a graph"):
  with members:
    - "on the power of simple reductions for the maximum independent set problem"
    - "a set and collection lemma"
    - "on the core of a unicyclic graph"
    - "on the intersection of all critical sets of a unicyclic graph"
    - "vertices belonging to all critical independent sets of a graph"
    - "on the structure of the minimum critical independent set of a graph"

Connected through hyperedge HE-3 (induced by source paper "monotonic properties of collections of maximum independent sets of a graph"):
  with members:
    - "a set and collection lemma"
    - "on the core of a unicyclic graph"
    - "on the intersection of all critical sets of a unicyclic graph"
    - "vertices belonging to all critical independent sets of a graph"
    - "on the structure of the minimum critical independent set of a graph"

Connected through hyperedge HE-4 (induced by source paper "critical independent sets of a graph"):
  with members:
    - "a set and collection lemma"
    - "vertices belonging to all critical independent sets of a graph"
    - "on the structure of the minimum critical independent set of a graph"

Connected through hyperedge HE-5 (induced by source paper "on the intersection of all critical sets of a unicyclic graph"):
  with members:
    - "a set and collection lemma"
    - "on the core of a unicyclic graph"
    - "vertices belonging to all critical independent sets of a graph"
    - "on the structure of the minimum critical independent set of a graph"

Connected through hyperedge HE-6 (induced by source paper "on the structure of the minimum critical independent set of a graph"):
  with members:
    - "vertices belonging to all critical independent sets of a graph"

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)