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: "summarizing semantic model differences"
  Abstract: Software EngineeringRWTH Aachen University, Germanyhttp://www.se-rwth.de/Abstract. Fundamental building blocks for managing and understand-ing software evolution in the context of model-driven engineering are dif-ferencing operators one can use for model comparisons. Semantic modeldi erencing deals with the de nition and computation of semantic di operators for model comparison, operators whose input consists of twomodels and whose output is a set of di witnesses, instances of one modelthat are not instances of the other. However, in many cases the completeset of di witnesses is too large to be eciently computed and e ectivelypresented. Moreover, many of the witnesses are very similar and hencenot interesting. Thus, an important challenge of semantic di erencingrelates to witness selection and presentation.In this paper we propose to address this challenge using a summarizationtechnique, based on a notion of equivalence that partitions the set of di witnesses. The result of the computation is a summary set, consisting ofa single representative witness from each equivalence class. We demon-strate our ideas using two concrete di operators, for class diagramsand for activity diagrams, where the computation of the summary set isecient and does not require the enumeration of all witnesses.

Connected through hyperedge HE-1 (induced by source paper "an interim summary on semantic model differencing"):
  with members:
    - "an operational semantics for activity diagrams using smv"
    - "cddiff semantic differencing for class diagrams"
    - "a manifesto for semantic model differencing"
    - "addiff semantic differencing for activity diagrams"

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.SE(Software Engineering)