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: "from event labeled gene trees to species trees"
  Abstract: Background: Tree reconciliation problems have long been studied in phylogenetics. A particular variant of the reconciliation problem for a gene tree T and a species tree S assumes that for each interior vertex x of T it is known whether x represents a speciation or a duplication. This problem appears in the context of analyzing orthology data. #R##N#Results: We show that S is a species tree for T if and only if S displays all rooted triples of T that have three distinct species as their leaves and are rooted in a speciation vertex. A valid reconciliation map can then be found in polynomial time. Simulated data shows that the event-labeled gene trees convey a large amount of information on underlying species trees, even for a large percentage of losses. #R##N#Conclusions: The knowledge of event labels in a gene tree strongly constrains the possible species tree and, for a given species tree, also the possible reconciliation maps. Nevertheless, many degrees of freedom remain in the space of feasible solutions. In order to disambiguate the alternative solutions additional external constraints as well as optimization criteria could be employed.

Connected through hyperedge HE-1 (induced by source paper "reconstruction of time consistent species trees"):
  with members:
    - "reconstructing gene trees from fitch s xenology relation"
    - "the mathematics of xenology di cographs symbolic ultrametrics 2 structures and tree representable systems of binary relations"
    - "phylogenomics with paralogs"

Connected through hyperedge HE-2 (induced by source paper "forbidden time travel characterization of time consistent tree reconciliation maps"):
  with members:
    - "from event labeled gene trees with horizontal gene transfer to species trees"
    - "the mathematics of xenology di cographs symbolic ultrametrics 2 structures and tree representable systems of binary relations"
    - "phylogenomics with paralogs"
    - "on symbolic ultrametrics cotree representations and cograph edge decompositions and partitions"
    - "on tree representations of relations and graphs symbolic ultrametrics and cograph edge decompositions"

Connected through hyperedge HE-3 (induced by source paper "reconstructing gene trees from fitch s xenology relation"):
  with members:
    - "generalized fitch graphs edge labeled graphs that are explained by edge labeled trees"
    - "partial homology relations satisfiability in terms of di cographs"
    - "the mathematics of xenology di cographs symbolic ultrametrics 2 structures and tree representable systems of binary relations"
    - "phylogenomics with paralogs"
    - "on tree representations of relations and graphs symbolic ultrametrics and cograph edge decompositions"

Connected through hyperedge HE-4 (induced by source paper "the mathematics of xenology di cographs symbolic ultrametrics 2 structures and tree representable systems of binary relations"):
  with members:
    - "techniques for the cograph editing problem module merge is equivalent to editing p4s"
    - "phylogenomics with paralogs"
    - "on symbolic ultrametrics cotree representations and cograph edge decompositions and partitions"
    - "on tree representations of relations and graphs symbolic ultrametrics and cograph edge decompositions"

Connected through hyperedge HE-5 (induced by source paper "on tree representations of relations and graphs symbolic ultrametrics and cograph edge decompositions"):
  with members:
    - "phylogenomics with paralogs"
    - "on symbolic ultrametrics cotree representations and cograph edge decompositions and partitions"
    - "partial star products a local covering approach for the recognition of approximate cartesian product graphs"

Connected through hyperedge HE-6 (induced by source paper "spiders can be recognized by counting their legs"):
  with members:
    - "phylogenomics with paralogs"

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)