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: "linear time temporal logic with event freezing functions"
  Abstract: Formal properties represent a cornerstone of the system-correctness proofs based on formal verification techniques such as model checking. Formalizing requirements into temporal properties may be very complex and error prone, due not only to the ambiguity of the textual requirements but also to the complexity of the formal language. Finding a property specification language that balances simplicity, expressiveness, and tool support remains an open problem in many real-world contexts. #R##N#In this paper, we propose a new temporal logic, which extends First-Order Linear-time Temporal Logic with Past adding two operators "at next" and "at last", which take in input a term and a formula and represent the value of the term at the next state in the future or last state in the past in which the formula holds. We consider different models of time (including discrete, dense, and super-dense time) and Satisfiability Modulo Theories (SMT) of the first-order formulas. The "at next" and "at last" functions can be seen as a generalization of Event-Clock operators and can encode some Metric Temporal operators also with counting. They are useful to formalize properties of component-based models because they allow to express constraints on the data exchanged with messages at different instants of time. We provide a simple encoding into equisatisfiable formulas without the extra functional symbols. We implement a prototype tool support based on SMT-based model checking.

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.LO(Logic in Computer Science)