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: "addiff semantic differencing for activity diagrams"
  Abstract: Activity diagrams (ADs) have recently become widely used in the modeling of workflows, business processes, and web-services, where they serve various purposes, from documentation, requirement definitions, and test case specifications, to simulation and code generation. As models, programs, and systems evolve over time, understanding changes and their impact is an important challenge, which has attracted much research efforts in recent years. In this paper we present addiff, a semantic differencing operator for ADs. Unlike most existing approaches to model comparison, which compare the concrete or the abstract syntax of two given diagrams and output a list of syntactical changes or edit operations, addiff considers the Semantics of the diagrams at hand and outputs a set of diff witnesses, each of which is an execution trace that is possible in the first AD and is not possible in the second. We motivate the use of addiff, formally define it, and show two algorithms to compute it, a concrete forward-search algorithm and a symbolic xpoint algorithm, implemented using BDDs and integrated into the Eclipse IDE. Empirical results and examples demonstrate the feasibility and unique contribution of addiff to the state-of-the-art in version comparison and evolution analysis.

Connected through hyperedge HE-1 (induced by source paper "empirical evaluation of effort on composing design models"):
  with members:
    - "cddiff semantic differencing for class diagrams"
    - "model driven development of complex software a research roadmap"

Connected through hyperedge HE-2 (induced by source paper "behavioral compatibility of simulink models for product line maintenance and evolution"):
  with members:
    - "architecture and behavior modeling of cyber physical systems with montiarcautomaton"
    - "monticore a framework for compositional development of domain specific languages"
    - "montiarc architectural modeling of interactive distributed and cyber physical systems"
    - "a manifesto for semantic model differencing"
    - "evolving delta oriented software product line architectures"

Connected through hyperedge HE-3 (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"
    - "summarizing semantic model differences"
    - "a manifesto for semantic model differencing"

Connected through hyperedge HE-4 (induced by source paper "model matching challenge benchmarks for ecore and bpmn diagrams"):
  with members:
    - "an interim summary on semantic model differencing"
    - "model evolution and management"
    - "cddiff semantic differencing for class diagrams"
    - "a manifesto for semantic model differencing"

Connected through hyperedge HE-5 (induced by source paper "summarizing semantic model differences"):
  with members:
    - "an operational semantics for activity diagrams using smv"
    - "cddiff semantic differencing for class diagrams"
    - "a manifesto for semantic model differencing"
    - "the uml as a formal modeling notation"

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)