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: "generalized fitch graphs edge labeled graphs that are explained by edge labeled trees"
  Abstract: Fitch graphs $G=(X,E)$ are di-graphs that are explained by $\{\otimes,1\}$-edge-labeled rooted trees with leaf set $X$: there is an arc $xy\in E$ if and only if the unique path in $T$ that connects the least common ancestor $\textrm{lca}(x,y)$ of $x$ and $y$ with $y$ contains at least one edge with label $1$. In practice, Fitch graphs represent xenology relations, i.e., pairs of genes $x$ and $y$ for which a horizontal gene transfer happened along the path from $\textrm{lca}(x,y)$ to $y$. In this contribution, we generalize the concept of xenology and Fitch graphs and consider complete di-graphs $K_{|X|}$ with vertex set $X$ and a map $\epsilon$ that assigns to each arc $xy$ a unique label $\epsilon(x,y)\in M\cup \{\otimes\}$, where $M$ denotes an arbitrary set of symbols. A di-graph $(K_{|X|},\epsilon)$ is a generalized Fitch graph if there is an $M\cup \{\otimes\}$-edge-labeled tree $(T,\lambda)$ that can explain $(K_{|X|},\epsilon)$. We provide a simple characterization of generalized Fitch graphs $(K_{|X|},\epsilon)$ and give an $O(|X|^2)$-time algorithm for their recognition as well as for the reconstruction of a least resolved phylogenetic tree that explains $(K_{|X|},\epsilon)$.

Connected through hyperedge HE-1 (induced by source paper "generalized fitch graphs iii symmetrized fitch maps and sets of symmetric binary relations that are explained by unrooted edge labeled trees"):
  with members:
    - "generalized fitch graphs ii sets of binary relations that are explained by edge labeled trees"
    - "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"

Connected through hyperedge HE-2 (induced by source paper "generalized fitch graphs ii sets of binary relations that are explained by edge labeled trees"):
  with members:
    - "generalized fitch graphs iii symmetrized fitch maps and sets of symmetric binary relations that are explained by unrooted edge labeled trees"
    - "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"
    - "beyond representing orthology relations by trees"
    - "phylogenomics with paralogs"

Connected through hyperedge HE-3 (induced by source paper "reconstructing gene trees from fitch s xenology relation"):
  with members:
    - "from event labeled gene trees to species 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"

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)