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: "the rank width of edge coloured graphs"
  Abstract: A C-coloured graph is a graph, that is possibly directed, where the edges are coloured with colours from the set C. Clique-width is a complexity measure for C-coloured graphs, for finite sets C. Rank-width is an equivalent complexity measure for undirected graphs and has good algorithmic and structural properties. It is in particular related to the vertex-minor relation. We discuss some possible extensions of the notion of rank-width to C-coloured graphs. There is not a unique natural notion of rank-width for C-coloured graphs. We define two notions of rank-width for them, both based on a coding of C-coloured graphs by ${\mathbb{F}}^{*}$ -graphs-- $\mathbb {F}$ -coloured graphs where each edge has exactly one colour from $\mathbb{F}\setminus \{0\},\ \mathbb{F}$ a field--and named respectively $\mathbb{F}$ -rank-width and $\mathbb {F}$ -bi-rank-width. The two notions are equivalent to clique-width. We then present a notion of vertex-minor for $\mathbb{F}^{*}$ -graphs and prove that $\mathbb{F}^{*}$ -graphs of bounded $\mathbb{F}$ -rank-width are characterised by a list of $\mathbb{F}^{*}$ -graphs to exclude as vertex-minors (this list is finite if $\mathbb{F}$ is finite). An algorithm that decides in time O(n 3) whether an $\mathbb{F}^{*}$ -graph with n vertices has $\mathbb{F}$ -rank-width (resp. $\mathbb{F}$ -bi-rank-width) at most k, for fixed k and fixed finite field $\mathbb{F}$ , is also given. Graph operations to check MSOL-definable properties on $\mathbb{F}^{*}$ -graphs of bounded $\mathbb{F}$ -rank-width (resp. $\mathbb{F}$ -bi-rank-width) are presented. A specialisation of all these notions to graphs without edge colours is presented, which shows that our results generalise the ones in undirected graphs.

Connected through hyperedge HE-1 (induced by source paper "comparing linear width parameters for directed graphs"):
  with members:
    - "on the pathwidth of almost semicomplete digraphs"
    - "subexponential parameterized algorithm for computing the cutwidth of a semi complete digraph"
    - "jungles bundles and fixed parameter tractability"
    - "matroid pathwidth and code trellis complexity"

Connected through hyperedge HE-2 (induced by source paper "finding branch decompositions of matroids hypergraphs and more"):
  with members:
    - "constructive algorithm for path width of matroids"

Connected through hyperedge HE-3 (induced by source paper "faster algorithms for vertex partitioning problems parameterized by clique width"):
  with members:
    - "interval deletion is fixed parameter tractable"
    - "known algorithms on graphs of bounded treewidth are probably optimal"
    - "a comparison of two approaches for polynomial time algorithms computing basic graph parameters"

Connected through hyperedge HE-4 (induced by source paper "computations by fly automata beyond monadic second order logic"):
  with members:
    - "fly automata model checking and recognizability"
    - "expansions of mso by cardinality relations"
    - "courcelle s theorem a game theoretic approach"
    - "algorithmic meta theorems"

Connected through hyperedge HE-5 (induced by source paper "jungles bundles and fixed parameter tractability"):
  with members:
    - "bidimensionality and kernels"
    - "designing fpt algorithms for cut problems using randomized contractions"
    - "bidimensionality and eptas"
    - "finding topological subgraphs is fixed parameter tractable"
    - "are there any good digraph width measures"
    - "kernels for feedback arc set in tournaments"
    - "computing crossing numbers in quadratic time"

Connected through hyperedge HE-6 (induced by source paper "better algorithms for satisfiability problems for formulas of bounded rank width"):
  with members:
    - "satisfiability of acyclic and almost acyclic cnf formulas"
    - "solving max r sat above a tight lower bound"
    - "almost 2 sat is fixed parameter tractable"

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)