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: "kempe equivalence of colourings of cubic graphs"
  Abstract: Given a graph $G=(V,E)$ and a proper vertex colouring of $G$, a Kempe chain is a subset of $V$ that induces a maximal connected subgraph of $G$ in which every vertex has one of two colours. To make a Kempe change is to obtain one colouring from another by exchanging the colours of vertices in a Kempe chain. Two colourings are Kempe equivalent if each can be obtained from the other by a series of Kempe changes. A conjecture of Mohar asserts that, for $k \geq 3$, all $k$-colourings of $k$-regular graphs that are not complete are Kempe equivalent. We address the case $k=3$ by showing that all $3$-colourings of a cubic graph $G$ are Kempe equivalent unless $G$ is the complete graph $K_4$ or the triangular prism.

Connected through hyperedge HE-1 (induced by source paper "distributed recoloring"):
  with members:
    - "an exponential separation between randomized and deterministic complexity in the local model"
    - "on a conjecture of mohar concerning kempe equivalence of regular graphs"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "recoloring graphs via tree decompositions"
    - "the complexity of change"

Connected through hyperedge HE-2 (induced by source paper "partitioning a graph into degenerate subgraphs"):
  with members:
    - "recognizing graphs close to bipartite graphs with an application to colouring reconfiguration"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "brooks vertex colouring theorem in linear time"

Connected through hyperedge HE-3 (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"
    - "on a conjecture of mohar concerning kempe equivalence of regular 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-4 (induced by source paper "token sliding on chordal graphs"):
  with members:
    - "on a conjecture of mohar concerning kempe equivalence of regular 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-5 (induced by source paper "on a conjecture of mohar concerning kempe equivalence of regular graphs"):
  with members:
    - "on the connectedness of clash free timetables"
    - "a reconfigurations analogue of brooks theorem and its consequences"
    - "recoloring graphs via tree decompositions"
    - "finding shortest paths between graph colourings"
    - "recoloring bounded treewidth graphs"
    - "the complexity of change"

Connected through hyperedge HE-6 (induced by source paper "on the connectedness of clash free timetables"):
  with members:
    - "shortest paths between shortest paths and independent sets"
    - "the complexity of rerouting shortest paths"
    - "the connectivity of boolean satisfiability computational and structural dichotomies"

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)