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: "asking the metaquestions in constraint tractability"
  Abstract: The constraint satisfaction problem (CSP) involves deciding, given a set of variables and a set of constraints on the variables, whether or not there is an assignment to the variables satisfying all of the constraints. One formulation of the CSP is as the problem of deciding, given a pair (G,H) of relational structures, whether or not there is a homomorphism from the first structure to the second structure. The CSP is in general NP-hard; a common way to restrict this problem is to fix the second structure H, so that each structure H gives rise to a problem CSP(H). The problem family CSP(H) has been studied using an algebraic approach, which links the algorithmic and complexity properties of each problem CSP(H) to a set of operations, the so-called polymorphisms of H. Certain types of polymorphisms are known to imply the polynomial-time tractability of $CSP(H)$, and others are conjectured to do so. This article systematically studies---for various classes of polymorphisms---the computational complexity of deciding whether or not a given structure H admits a polymorphism from the class. Among other results, we prove the NP-completeness of deciding a condition conjectured to characterize the tractable problems CSP(H), as well as the NP-completeness of deciding if CSP(H) has bounded width.

Connected through hyperedge HE-1 (induced by source paper "algebraic approach to promise constraint satisfaction"):
  with members:
    - "topology is relevant in a dichotomy conjecture for infinite domain constraint satisfaction problems"
    - "promises make finite constraint satisfaction problems infinitary"
    - "dichotomy for symmetric boolean pcsps"
    - "an algorithmic blend of lps and ring equations for promise csps"
    - "improved inapproximability of rainbow coloring"
    - "super polylogarithmic hypergraph coloring hardness via low degree long codes"
    - "promise constraint satisfaction algebraic structure and a symmetric boolean dichotomy"
    - "a dichotomy theorem for nonuniform csps"

Connected through hyperedge HE-2 (induced by source paper "testing the complexity of a valued csp language"):
  with members:
    - "which np hard sat and csp problems admit exponentially improved algorithms"
    - "a dichotomy theorem for nonuniform csps"
    - "the proof of csp dichotomy conjecture"
    - "time complexity of constraint satisfaction via universal algebra"
    - "lower bounds for the graph homomorphism problem"
    - "algebraic properties of valued constraint satisfaction problem"
    - "the complexity of general valued csps"

Connected through hyperedge HE-3 (induced by source paper "dichotomies in ontology mediated querying with the guarded fragment"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "rewritability in monadic disjunctive datalog mmsnp and expressive description logics"
    - "extending consequence based reasoning to sriq"
    - "query rewriting and optimization for ontological databases"
    - "querying the guarded fragment"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "a dichotomy on the complexity of consistent query answering for atoms with simple keys"
    - "description logic tboxes model theoretic characterizations and rewritability"

Connected through hyperedge HE-4 (induced by source paper "rewritability in monadic disjunctive datalog mmsnp and expressive description logics"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "the proof of csp dichotomy conjecture"
    - "the data complexity of description logic ontologies"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "universal structures and the logic of forbidden patterns"
    - "the dl lite family and relations"
    - "datalog and constraint satisfaction with infinite templates"
    - "a characterisation of first order constraint satisfaction problems"

Connected through hyperedge HE-5 (induced by source paper "a dichotomy theorem for nonuniform csps"):
  with members:
    - "constraint satisfaction problems over semilattice block mal tsev algebras"
    - "weaker consistency notions for all the csps of bounded width"
    - "graphs of finite algebras edges and connectivity"
    - "conservative constraint satisfaction re revisited"
    - "absorbing subalgebras cyclic terms and the constraint satisfaction problem"
    - "a characterisation of first order constraint satisfaction problems"

Connected through hyperedge HE-6 (induced by source paper "towards a characterization of constant factor approximable finite valued csps"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "the proof of csp dichotomy conjecture"
    - "the complexity of finite valued csps"
    - "robust algorithms with polynomial loss for near unanimity csps"
    - "combinatorial optimization algorithms via polymorphisms"
    - "the complexity of general valued csps"
    - "local distribution and the symmetry gap approximability of multiway partitioning problems"
    - "robustly solvable constraint satisfaction problems"

Connected through hyperedge HE-7 (induced by source paper "all or nothing toward a promise problem dichotomy for constraint problems"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "gap theorems for robust satisfiability boolean csps and beyond"
    - "on minimal constraint networks"

Connected through hyperedge HE-8 (induced by source paper "bi arc digraphs and conservative polymorphisms"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "testing assignments to constraint satisfaction problems"
    - "the dichotomy of list homomorphisms for digraphs"

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)