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: "recoloring graphs via tree decompositions"
  Abstract: Let $k$ be an integer. Two vertex $k$-colorings of a graph are \emph{adjacent} if they differ on exactly one vertex. A graph is \emph{$k$-mixing} if any proper $k$-coloring can be transformed into any other through a sequence of adjacent proper $k$-colorings. Jerrum proved that any graph is $k$-mixing if $k$ is at least the maximum degree plus two. We first improve Jerrum's bound using the grundy number, which is the worst number of colors in a greedy coloring. #R##N#Any graph is $(tw+2)$-mixing, where $tw$ is the treewidth of the graph (Cereceda 2006). We prove that the shortest sequence between any two $(tw+2)$-colorings is at most quadratic (which is optimal up to a constant factor), a problem left open in Bonamy et al. (2012). #R##N#We also prove that given any two $(\chi(G)+1)$-colorings of a cograph (resp. distance-hereditary graph) $G$, we can find a linear (resp. quadratic) sequence between them. In both cases, the bounds cannot be improved by more than a constant factor for a fixed $\chi(G)$. The graph classes are also optimal in some sense: one of the smallest interesting superclass of distance-hereditary graphs corresponds to comparability graphs, for which no such property holds (even when relaxing the constraint on the length of the sequence). As for cographs, they are equivalently the graphs with no induced $P_4$, and there exist $P_5$-free graphs that admit no sequence between two of their $(\chi(G)+1)$-colorings. #R##N#All the proofs are constructivist and lead to polynomial-time recoloring algorithm

Connected through hyperedge HE-1 (induced by source paper "a polynomial version of cereceda s conjecture"):
  with members:
    - "reoptimization of parameterized problems"
    - "towards cereceda s conjecture for planar graphs"
    - "improved bounds for randomly sampling colorings via linear programming"
    - "on a conjecture of mohar concerning kempe equivalence of regular graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "flipping edge labelled triangulations"

Connected through hyperedge HE-2 (induced by source paper "distributed recoloring"):
  with members:
    - "an exponential separation between randomized and deterministic complexity in the local model"
    - "kempe equivalence of colourings of cubic graphs"
    - "on a conjecture of mohar concerning kempe equivalence of regular graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "the complexity of change"

Connected through hyperedge HE-3 (induced by source paper "linear transformations between colorings in chordal graphs"):
  with members:
    - "a polynomial version of cereceda s conjecture"
    - "reoptimization of parameterized problems"
    - "flipping edge labelled triangulations"

Connected through hyperedge HE-4 (induced by source paper "shortest reconfiguration of matchings"):
  with members:
    - "an improved fpt algorithm for the flip distance problem"
    - "solving the rubik s cube optimally is np complete"
    - "the complexity of independent set reconfiguration on bipartite graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "flip distance between triangulations of a simple polygon is np complete"
    - "shortest reconfiguration of sliding tokens on a caterpillar"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "shortest reconfiguration paths in the solution space of boolean formulas"

Connected through hyperedge HE-5 (induced by source paper "reconfiguration of graphs with connectivity constraints"):
  with members:
    - "the complexity of change"
    - "pspace completeness of sliding block puzzles and other problems through the nondeterministic constraint logic model of computation"

Connected through hyperedge HE-6 (induced by source paper "towards cereceda s conjecture for planar graphs"):
  with members:
    - "a reconfigurations analogue of brooks theorem and its consequences"

Connected through hyperedge HE-7 (induced by source paper "using contracted solution graphs for solving reconfiguration problems"):
  with members:
    - "recognizing graphs close to bipartite graphs with an application to colouring reconfiguration"
    - "parameterized complexity of the list coloring reconfiguration problem with graph parameters"
    - "parameterized complexity of graph constraint logic"
    - "the complexity of dominating set reconfiguration"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "the list coloring reconfiguration problem for bounded pathwidth graphs"
    - "reconfiguration on sparse graphs"
    - "reconfiguring independent sets in claw free graphs"

Connected through hyperedge HE-8 (induced by source paper "on a conjecture of mohar concerning kempe equivalence of regular graphs"):
  with members:
    - "on the connectedness of clash free timetables"
    - "kempe equivalence of colourings of cubic graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "finding shortest paths between graph colourings"
    - "recoloring bounded treewidth graphs"
    - "the complexity of change"

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)