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: "answering ucqs under updates and in the presence of integrity constraints"
  Abstract: We investigate the query evaluation problem for fixed queries over fully dynamic databases where tuples can be inserted or deleted. The task is to design a dynamic data structure that can immediately report the new result of a fixed query after every database update. We consider unions of conjunctive queries (UCQs) and focus on the query evaluation tasks testing (decide whether an input tuple belongs to the query result), enumeration (enumerate, without repetition, all tuples in the query result), and counting (output the number of tuples in the query result). #R##N#We identify three increasingly restrictive classes of UCQs which we call t-hierarchical, q-hierarchical, and exhaustively q-hierarchical UCQs. Our main results provide the following dichotomies: If the query's homomorphic core is t-hierarchical (q-hierarchical, exhaustively q-hierarchical), then the testing (enumeration, counting) problem can be solved with constant update time and constant testing time (delay, counting time). Otherwise, it cannot be solved with sublinear update time and sublinear testing time (delay, counting time), unless the OV-conjecture and/or the OMv-conjecture fails. #R##N#We also study the complexity of query evaluation in the dynamic setting in the presence of integrity constraints, and we obtain according dichotomy results for the special case of small domain constraints (i.e., constraints which state that all values in a particular column of a relation belong to a fixed domain of constant size).

Connected through hyperedge HE-1 (induced by source paper "constant delay enumeration with fpt preprocessing for conjunctive queries of bounded submodular width"):
  with members:
    - "enumeration on trees under relabelings"
    - "answering fo mod queries under updates on bounded degree databases"
    - "covers of query results"
    - "constraint solving via fractional edge covers"
    - "answering conjunctive queries under updates"
    - "compressed representations of conjunctive query results"
    - "what do shannon type inequalities submodular width and disjunctive datalog have to do with one another"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"

Connected through hyperedge HE-2 (induced by source paper "answering unions of conjunctive queries using random access and random order enumeration"):
  with members:
    - "optimal algorithms for ranked enumeration of answers to full conjunctive queries"
    - "ranked enumeration of conjunctive query results"
    - "on the enumeration complexity of unions of conjunctive queries"
    - "enumeration complexity of conjunctive queries with functional dependencies"
    - "tight hardness for shortest cycles and paths in sparse graphs"
    - "powers of tensors and fast matrix multiplication"
    - "popular conjectures imply strong lower bounds for dynamic problems"

Connected through hyperedge HE-3 (induced by source paper "incremental techniques for large scale dynamic query processing"):
  with members:
    - "counting triangles under updates in worst case optimal time"
    - "answering fo mod queries under updates on bounded degree databases"
    - "incremental view maintenance with triple lock factorization benefits"
    - "answering conjunctive queries under updates"
    - "linview incremental view maintenance for complex analytical queries"
    - "dbtoaster higher order delta processing for dynamic frequently fresh views"

Connected through hyperedge HE-4 (induced by source paper "constant delay enumeration for nondeterministic document spanners"):
  with members:
    - "enumeration on trees with tractable combined complexity and efficient updates"
    - "enumeration on trees under relabelings"
    - "constant delay algorithms for regular document spanners"
    - "answering fo mod queries under updates on bounded degree databases"
    - "a circuit based approach to efficient enumeration"
    - "answering conjunctive queries under updates"
    - "document spanners for extracting incomplete information expressiveness and complexity"
    - "joining extractions of regular expressions"

Connected through hyperedge HE-5 (induced by source paper "enumeration on trees with tractable combined complexity and efficient updates"):
  with members:
    - "constant delay enumeration for nondeterministic document spanners"
    - "enumeration on trees under relabelings"
    - "constant delay algorithms for regular document spanners"
    - "answering fo mod queries under updates on bounded degree databases"
    - "a circuit based approach to efficient enumeration"
    - "answering conjunctive queries under updates"
    - "enumeration complexity of conjunctive queries with functional dependencies"
    - "powers of tensors and fast matrix multiplication"

Connected through hyperedge HE-6 (induced by source paper "counting triangles under updates in worst case optimal time"):
  with members:
    - "worst case optimal join algorithms techniques results and open problems"
    - "incremental view maintenance with triple lock factorization benefits"
    - "answering conjunctive queries under updates"
    - "the dynamic descriptive complexity of k clique"
    - "unifying and strengthening hardness for dynamic problems via the online matrix vector multiplication conjecture"
    - "approximately counting triangles in sublinear time"
    - "faq questions asked frequently"
    - "skew strikes back new developments in the theory of join algorithms"

Connected through hyperedge HE-7 (induced by source paper "on the enumeration complexity of unions of conjunctive queries"):
  with members:
    - "constant delay algorithms for regular document spanners"
    - "answering conjunctive queries under updates"
    - "enumeration complexity of conjunctive queries with functional dependencies"
    - "tight hardness for shortest cycles and paths in sparse graphs"
    - "powers of tensors and fast matrix multiplication"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "first order queries on structures of bounded degree are computable with constant delay"

Connected through hyperedge HE-8 (induced by source paper "answering fo mod queries under updates on bounded degree databases"):
  with members:
    - "answering conjunctive queries under updates"
    - "first order logic with counting at least weak hanf normal forms always exist and can be computed"
    - "first order query evaluation with cardinality conditions"
    - "deciding first order properties of nowhere dense graphs"
    - "first order query evaluation on structures of bounded degree"
    - "first order queries on structures of bounded degree are computable with constant delay"

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.DB(Databases)