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: "deciding first order properties of locally tree decomposable structures"
  Abstract: We introduce the concept of a class of graphs, or more generally, relational structures, being locally tree-decomposable. There are numerous examples of locally tree-decomposable classes, among them the class of planar graphs and all classes of bounded valence or of bounded tree-width. We also consider a slightly more general concept of a class of structures having bounded local tree-width. #R##N#We show that for each property P of structures that is definable in first-order logic and for each locally tree-decomposable class C of graphs, there is a linear time algorithm deciding whether a given structure A in C has property P. For classes C of bounded local tree-width, we show that for every k\ge 1 there is an algorithm that solves the same problem in time O(n^{1+(1/k)}) (where n is the cardinality of the input structure).

Connected through hyperedge HE-1 (induced by source paper "hitting topological minors is fpt"):
  with members:
    - "hitting topological minor models in planar graphs is fixed parameter tractable"
    - "improved analysis of highest degree branching for feedback vertex set"
    - "losing treewidth by separating subsets"
    - "a 2 approximation algorithm for feedback vertex set in tournaments"
    - "polylogarithmic approximation for minimum planarization almost"
    - "exact algorithms for maximum independent set"
    - "bidimensionality and kernels"
    - "exact algorithms via monotone local search"

Connected through hyperedge HE-2 (induced by source paper "tight bounds for planar strongly connected steiner subgraph with fixed number of terminals and extensions"):
  with members:
    - "fpt inapproximability of directed cut and connectivity problems"
    - "complexity of the steiner network problem with respect to the number of terminals"
    - "the parameterized complexity of finding point sets with hereditary properties"
    - "homomorphisms are a good basis for counting small subgraphs"
    - "parameterized approximation algorithms for directed steiner network problems"
    - "the graph motif problem parameterized by the structure of the input graph"
    - "on subexponential parameterized algorithms for steiner tree and directed subset tsp on planar graphs"
    - "on the parameterized complexity of red blue points separation"

Connected through hyperedge HE-3 (induced by source paper "nowhere dense graph classes and algorithmic applications a tutorial at highlights of logic games and automata 2019"):
  with members:
    - "classes of graphs with low complexity the case of classes with bounded linear rankwidth"
    - "kernelization and approximation of distance r independent sets on nowhere dense graphs"
    - "empirical evaluation of approximation algorithms for generalized graph coloring and uniform quasi wideness"
    - "on low rank width colorings"
    - "distributed domination on graph classes of bounded expansion"
    - "on the number of types in sparse graphs"
    - "the generalised colouring numbers on classes of bounded expansion"
    - "polynomial kernels and wideness properties of nowhere dense graph classes"

Connected through hyperedge HE-4 (induced by source paper "counting and finding homomorphisms is universal for parameterized complexity theory"):
  with members:
    - "counting answers to existential questions"
    - "parameterized intractability of even set and shortest vector problem from gap eth"
    - "homomorphisms are a good basis for counting small subgraphs"
    - "a dichotomy theorem for nonuniform csps"
    - "complexity of counting subgraphs only the boundedness of the vertex cover number counts"
    - "complexity of counting csp with complex weights"
    - "subgraph isomorphism in planar graphs and related problems"

Connected through hyperedge HE-5 (induced by source paper "query preserving watermarking schemes for locally treelike databases"):
  with members:
    - "on the number of types in sparse graphs"
    - "deciding first order properties of nowhere dense graphs"
    - "algorithmic meta theorems"
    - "fixed parameter tractability definability and model checking"

Connected through hyperedge HE-6 (induced by source paper "model checking on ordered structures"):
  with members:
    - "order invariance on decomposable structures"
    - "successor invariant first order logic on graphs with excluded topological subgraphs"
    - "lower bounds for approximation schemes for closest string"
    - "model checking existential logic on partially ordered sets"
    - "deciding first order properties of nowhere dense graphs"
    - "courcelle s theorem a game theoretic approach"
    - "lower bounds for the complexity of monadic second order logic"

Connected through hyperedge HE-7 (induced by source paper "a new perspective on fo model checking of dense graph classes"):
  with members:
    - "model checking for successor invariant first order formulas on graph classes of bounded expansion"
    - "fo model checking of interval graphs"
    - "model checking existential logic on partially ordered sets"
    - "faster existential fo model checking on posets"

Connected through hyperedge HE-8 (induced by source paper "on the parameterized complexity of graph modification to first order logic properties"):
  with members:
    - "kernelization lower bounds by cross composition"
    - "on the non existence of polynomial kernels for p l free edge modification problems"

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.DS(Data Structures and Algorithms)