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: "strong products of hypergraphs unique prime factorization theorems and algorithms"
  Abstract: Abstract   It is well-known that all finite connected graphs have a unique prime factor decomposition (PFD) with respect to the strong graph product which can be computed in polynomial time. Essential for the PFD computation is the construction of the so-called Cartesian skeleton of the graphs under investigation.  In this contribution, we show that every connected thin hypergraph    H    has a unique prime factorization with respect to the normal and strong (hypergraph) product. Both products coincide with the usual strong graph product whenever    H    is a graph. We introduce the notion of the Cartesian skeleton of hypergraphs as a natural generalization of the Cartesian skeleton of graphs and prove that it is uniquely defined for thin hypergraphs. Moreover, we show that the Cartesian skeleton of hypergraphs can be determined in    O   (     |  E  |     2    )     time and that the PFD can be computed in    O   (     |  V  |     2     |  E  |   )     time, for hypergraphs    H  =   (  V  ,  E  )     with bounded degree and bounded rank.

Connected through hyperedge HE-1 (induced by source paper "a local prime factor decomposition algorithm for strong product graphs"):
  with members:
    - "local algorithms for the prime factorization of strong product graphs"
    - "the relaxed square property"
    - "on the complexity of recognizing s composite and s prime graphs"
    - "a survey on hypergraph products"

Connected through hyperedge HE-2 (induced by source paper "on the cartesian skeleton and the factorization of the strong product of digraphs"):
  with members:
    - "local algorithms for the prime factorization of strong product graphs"
    - "fast recognition of partial star products and quasi cartesian products"
    - "partial star products a local covering approach for the recognition of approximate cartesian product graphs"
    - "a survey on hypergraph products"

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)