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: "invariant generation through strategy iteration in succinctly represented control flow graphs"
  Abstract: We consider the problem of computing numerical invariants of programs, for#N#instance bounds on the values of numerical program variables. More#N#specifically, we study the problem of performing static analysis by abstract#N#interpretation using template linear constraint domains. Such invariants can be#N#obtained by Kleene iterations that are, in order to guarantee termination,#N#accelerated by widening operators. In many cases, however, applying this form#N#of extrapolation leads to invariants that are weaker than the strongest#N#inductive invariant that can be expressed within the abstract domain in use.#N#Another well-known source of imprecision of traditional abstract interpretation#N#techniques stems from their use of join operators at merge nodes in the control#N#flow graph. The mentioned weaknesses may prevent these methods from proving#N#safety properties. The technique we develop in this article addresses both of#N#these issues: contrary to Kleene iterations accelerated by widening operators,#N#it is guaranteed to yield the strongest inductive invariant that can be#N#expressed within the template linear constraint domain in use. It also eschews#N#join operators by distinguishing all paths of loop-free code segments. Formally#N#speaking, our technique computes the least fixpoint within a given template#N#linear constraint domain of a transition relation that is succinctly expressed#N#as an existentially quantified linear real arithmetic formula. In contrast to#N#previously published techniques that rely on quantifier elimination, our#N#algorithm is proved to have optimal complexity: we prove that the decision#N#problem associated with our fixpoint problem is in the second level of the#N#polynomial-time hierarchy.

Connected through hyperedge HE-1 (induced by source paper "a survey of satisfiability modulo theory"):
  with members:
    - "proof tree preserving interpolation"
    - "how to compute worst case execution time by optimization modulo theory and a clever encoding of program semantics"
    - "generating non linear interpolants by semidefinite programming"
    - "pagai a path sensitive static analyzer"
    - "succinct representations for abstract interpretation"
    - "optimization in smt with la q cost functions"
    - "on using floating point computations to help an exact linear arithmetic decision procedure"
    - "a quantifier elimination algorithm for linear real arithmetic"

Connected through hyperedge HE-2 (induced by source paper "how hard is it to verify flat affine counter systems with the finite monoid property"):
  with members:
    - "reachability in two dimensional vector addition systems with states is pspace complete"
    - "a concurrent pattern calculus"
    - "subclasses of presburger arithmetic and the weak exp hierarchy"
    - "deciding conditional termination"
    - "on the complexity of verifying regular properties on flat counter systems"
    - "taming past ltl and flat counter systems"

Connected through hyperedge HE-3 (induced by source paper "program analysis with local policy iteration"):
  with members:
    - "pagai a path sensitive static analyzer"
    - "using bounded model checking to focus fixpoint iterations"
    - "automatic modular abstractions for template numerical constraints"
    - "cpachecker a tool for configurable software verification"
    - "the octagon abstract domain"

Connected through hyperedge HE-4 (induced by source paper "scaling up logico numerical strategy iteration extended version"):
  with members:
    - "optimization in smt with la q cost functions"
    - "automatic modular abstractions for template numerical constraints"
    - "a static analyzer for large safety critical software"

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.PL(Programming Languages)