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: "one hierarchy spawns another graph deconstructions and the complexity classification of conjunctive queries"
  Abstract: We study the problem of conjunctive query evaluation relative to a class of queries; this problem is formulated here as the relational homomorphism problem relative to a class of structures A, wherein each instance must be a pair of structures such that the first structure is an element of A. We present a comprehensive complexity classification of these problems, which strongly links graph-theoretic properties of A to the complexity of the corresponding homomorphism problem. In particular, we define a binary relation on graph classes, which is a preorder, and completely describe the resulting hierarchy given by this relation. This relation is defined in terms of a notion which we call graph deconstruction and which is a variant of the well-known notion of tree decomposition. We then use this hierarchy of graph classes to infer a complexity hierarchy of homomorphism problems which is comprehensive up to a computationally very weak notion of reduction, namely, a parameterized version of quantifier-free first-order reduction. In doing so, we obtain a significantly refined complexity classification of homomorphism problems, as well as a unifying, modular, and conceptually clean treatment of existing complexity classifications. We then present and develop the theory of Ehrenfeucht-Fraisse-style pebble games which solve the homomorphism problems where the cores of the structures in A have bounded tree depth. Finally, we use our framework to classify the complexity of model checking existential sentences having bounded quantifier rank.

Connected through hyperedge HE-1 (induced by source paper "polynomial kernels for hitting forbidden minors under structural parameterizations"):
  with members:
    - "vertex cover structural parameterization revisited"
    - "uniform kernelization complexity of hitting forbidden minors"
    - "a faster parameterized algorithm for treedepth"

Connected through hyperedge HE-2 (induced by source paper "the parameterized space complexity of model checking bounded variable first order logic"):
  with members:
    - "computing hitting set kernels by ac 0 circuits"
    - "fast parallel fixed parameter algorithms via color coding"
    - "deciding first order properties of nowhere dense graphs"
    - "on the complexity of existential positive queries"
    - "bounds on monotone switching networks for directed connectivity"
    - "fixed parameter tractability definability and model checking"

Connected through hyperedge HE-3 (induced by source paper "the hardness of embedding grids and walls"):
  with members:
    - "characterizing the easy to find subgraphs from the viewpoint of polynomial time algorithms kernels and turing kernels"
    - "the parameterized complexity of k biclique"
    - "everything you always wanted to know about the parameterized complexity of subgraph isomorphism but were afraid to ask"
    - "subgraph isomorphism in planar graphs and related problems"

Connected through hyperedge HE-4 (induced by source paper "counting answers to existential positive queries a complexity classification"):
  with members:
    - "the tractability frontier of graph like first order query sets"
    - "a trichotomy in the complexity of counting answers to conjunctive queries"
    - "structural tractability of counting of solutions to conjunctive queries"
    - "on the complexity of existential positive queries"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"

Connected through hyperedge HE-5 (induced by source paper "the logic of counting query answers"):
  with members:
    - "counting answers to existential positive queries a complexity classification"
    - "the tractability frontier of graph like first order query sets"
    - "a trichotomy in the complexity of counting answers to conjunctive queries"
    - "structural tractability of counting of solutions to conjunctive queries"
    - "tree width for first order formulae"
    - "on the complexity of existential positive queries"

Connected through hyperedge HE-6 (induced by source paper "on space efficiency of algorithms working on structural decompositions of graphs"):
  with members:
    - "an o n epsilon space and polynomial time algorithm for reachability in directed layered planar graphs"
    - "space saving by dynamic algebraization"
    - "space time tradeoffs for subset sum an improved worst case algorithm"
    - "where first order and monadic second order logic coincide"
    - "narrow sieves for parameterized paths and packings"
    - "model checking problems as a basis for parameterized intractability"

Connected through hyperedge HE-7 (induced by source paper "the tractability frontier of graph like first order query sets"):
  with members:
    - "counting answers to existential positive queries a complexity classification"
    - "complexity of counting subgraphs only the boundedness of the vertex cover number counts"
    - "a trichotomy in the complexity of counting answers to conjunctive queries"
    - "structural tractability of counting of solutions to conjunctive queries"
    - "the fine classification of conjunctive queries and parameterized logarithmic space complexity"
    - "tree width for first order formulae"
    - "on the complexity of existential positive queries"

Connected through hyperedge HE-8 (induced by source paper "a trichotomy in the complexity of counting answers to conjunctive queries"):
  with members:
    - "the tractability frontier of graph like first order query sets"
    - "structural tractability of counting of solutions to conjunctive queries"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "hypertree decompositions and tractable queries"

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.CC(Computational Complexity)