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: "on a conjecture of mohar concerning kempe equivalence of regular graphs"
  Abstract: Let $G$ be a graph with a vertex colouring $\alpha$. Let $a$ and $b$ be two colours. Then a connected component of the subgraph induced by those vertices coloured either $a$ or $b$ is known as a Kempe chain. A colouring of $G$ obtained from $\alpha$ by swapping the colours on the vertices of a Kempe chain is said to have been obtained by a Kempe change. Two colourings of $G$ are Kempe equivalent if one can be obtained from the other by a sequence of Kempe changes. #R##N#A conjecture of Mohar (2007) asserts that, for $k \geq 3$, all $k$-colourings of a $k$-regular graph that is not complete are Kempe equivalent. It was later shown that all $3$-colourings of a cubic graph that is neither $K_4$ nor the triangular prism are Kempe equivalent. In this paper, we prove that the conjecture holds for each $k\geq 4$. We also report the implications of this result on the validity of the Wang-Swendsen-Koteck\'{y} algorithm for the antiferromagnetic Potts model at zero-temperature.

Connected through hyperedge HE-1 (induced by source paper "dominating sets reconfiguration under token sliding"):
  with members:
    - "decremental optimization of dominating sets under reachability constraints"
    - "the complexity of independent set reconfiguration on bipartite graphs"
    - "token jumping in minor closed classes"
    - "the complexity of dominating set reconfiguration"
    - "reconfiguration on sparse graphs"
    - "shortest reconfiguration paths in the solution space of boolean formulas"
    - "reconfiguration of dominating sets"
    - "on the parameterized complexity of reconfiguration problems"

Connected through hyperedge HE-2 (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"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "recoloring graphs via tree decompositions"
    - "flipping edge labelled triangulations"

Connected through hyperedge HE-3 (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"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "recoloring graphs via tree decompositions"
    - "the complexity of change"

Connected through hyperedge HE-4 (induced by source paper "token jumping in minor closed classes"):
  with members:
    - "token sliding on chordal graphs"
    - "identifying codes in hereditary classes of graphs and vc dimension"
    - "kempe equivalence of colourings of cubic graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "reconfiguration on sparse graphs"
    - "reconfiguring independent sets in claw free graphs"
    - "reconfiguration over tree decompositions"
    - "reconfiguring independent sets in cographs"

Connected through hyperedge HE-5 (induced by source paper "token sliding on chordal graphs"):
  with members:
    - "kempe equivalence of colourings of cubic graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "shortest reconfiguration of sliding tokens on a caterpillar"
    - "reconfiguring independent sets in claw free graphs"
    - "reconfiguring independent sets in cographs"
    - "fixed parameter tractability of token jumping on planar graphs"
    - "independent set reconfiguration in cographs"
    - "recoloring bounded treewidth graphs"

Connected through hyperedge HE-6 (induced by source paper "kempe equivalence of colourings of cubic graphs"):
  with members:
    - "on the connectedness of clash free timetables"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "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)