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: "local algorithms for the prime factorization of strong product graphs"
  Abstract: The practical application of graph prime factorization algorithms is limited in practice by unavoidable noise in the data. A first step towards error-tolerant "approximate" prime factorization, is the development of local approaches that cover the graph by factorizable patches and then use this information to derive global factors. We present here a local, quasi-linear al- gorithm for the prime factorization of "locally unrefined" graphs with respect to the strong product. To this end we introduce the backbone B(G) for a given graph G and show that the neighborhoods of the backbone vertices provide enough information to determine the global prime factors.

Connected through hyperedge HE-1 (induced by source paper "a local prime factor decomposition algorithm for strong product graphs"):
  with members:
    - "strong products of hypergraphs unique prime factorization theorems and algorithms"
    - "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:
    - "strong products of hypergraphs unique prime factorization theorems and algorithms"
    - "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"

Connected through hyperedge HE-3 (induced by source paper "unique square property equitable partitions and product like graphs"):
  with members:
    - "partial star products a local covering approach for the recognition of approximate cartesian product graphs"

Connected through hyperedge HE-4 (induced by source paper "partial star products a local covering approach for the recognition of approximate cartesian product graphs"):
  with members:
    - "unique square property equitable partitions and product like 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)