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: "propositional satisfiability in answer set programming"
  Abstract: We show that propositional logic and its extensions can support answer-set programming in the same way stable logic programming and disjunctive logic programming do. To this end, we introduce a logic based on the logic of propositional schemata and on a version of the Closed World Assumption. We call it the extended logic of propositional schemata with CWA (PS+, in symbols). An important feature of this logic is that it supports explicit modeling of constraints on cardinalities of sets. In the paper, we characterize the class of problems that can be solved by finite PS+ theories. We implement a programming system based on the logic PS+ and design and implement a solver for processing theories in PS+. We present encouraging performance results for our approach --- we show it to be competitive with smodels, a state-of-the-art answer-set programming system based on stable logic programming.

Connected through hyperedge HE-1 (induced by source paper "constraint propagation for first order logic and inductive definitions"):
  with members:
    - "lifted unit propagation for effective grounding"
    - "grounding fo and fo id with bounds"
    - "fo fd extending classical logic with rule based fixpoint definitions"
    - "design and implementation of aggregate functions in the dlv system"
    - "the dlv system for knowledge representation and reasoning"
    - "well founded and stable semantics of logic programs with aggregates"
    - "extending classical logic with inductive definitions"
    - "smodels a system for answer set programming"

Connected through hyperedge HE-2 (induced by source paper "the dlv system for knowledge representation and reasoning"):
  with members:
    - "unfolding partiality and disjunctions in stable model semantics"
    - "answer set planning under action costs"
    - "a logic programming approach to knowledge state planning ii the dlv k system"
    - "computing preferred answer sets by meta interpretation in answer set programming"
    - "a polynomial translation of logic programs with nested expressions into disjunctive logic programs preliminary report"
    - "disjunctive logic programs with inheritance"
    - "on properties of update sequences based on causal rejection"
    - "dlv a system for declarative problem solving"

Connected through hyperedge HE-3 (induced by source paper "generalizing boolean satisfiability i background and survey of existing work"):
  with members:
    - "the dlv system for knowledge representation and reasoning"
    - "generalizing boolean satisfiability iii implementation"
    - "generalizing boolean satisfiability ii theory"
    - "propositional satisfiability in declarative programming"
    - "stable models and an alternative logic programming paradigm"

Connected through hyperedge HE-4 (induced by source paper "logic programs with monotone cardinality atoms"):
  with members:
    - "tight logic programs"
    - "local search techniques for propositional logic extended with cardinality constraints"
    - "ultimate approximations in nonmonotonic knowledge representation systems"

Connected through hyperedge HE-5 (induced by source paper "wsat cc a fast local search asp solver"):
  with members:
    - "satisfiability and computing van der waerden numbers"
    - "local search techniques for propositional logic extended with cardinality constraints"

Connected through hyperedge HE-6 (induced by source paper "propositional satisfiability in declarative programming"):
  with members:
    - "stable models and an alternative logic programming paradigm"

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.AI(Artificial Intelligence)