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: "towards the formal reliability analysis of oil and gas pipelines"
  Abstract: It is customary to assess the reliability of underground oil and gas pipelines in the presence of excessive loading and corrosion effects to ensure a leak-free transport of hazardous materials. The main idea behind this reliability analysis is to model the given pipeline system as a Reliability Block Diagram (RBD) of segments such that the reliability of an individual pipeline segment can be represented by a random variable. Traditionally, computer simulation is used to perform this reliability analysis but it provides approximate results and requires an enormous amount of CPU time for attaining reasonable estimates. Due to its approximate nature, simulation is not very suitable for analyzing safety-critical systems like oil and gas pipelines, where even minor analysis flaws may result in catastrophic consequences. As an accurate alternative, we propose to use a higher-order-logic theorem prover (HOL) for the reliability analysis of pipelines. As a first step towards this idea, this paper provides a higher-order-logic formalization of reliability and the series RBD using the HOL theorem prover. For illustration, we present the formal analysis of a simple pipeline that can be modeled as a series RBD of segments with exponentially distributed failure times.

Connected through hyperedge HE-1 (induced by source paper "formal verification of cyber physical systems using theorem proving invited paper"):
  with members:
    - "formal analysis of robotic cell injection systems using theorem proving"
    - "qwire practice formal verification of quantum circuits in coq"
    - "formal analysis of linear control systems using theorem proving"
    - "formal analysis of continuous time systems using fourier transform"
    - "formalization of transform methods using hol light"
    - "towards formal fault tree analysis using theorem proving"
    - "a verified compiler for probability density functions"
    - "formal analysis of optical systems"

Connected through hyperedge HE-2 (induced by source paper "on the formalization of importance measures using hol theorem proving"):
  with members:
    - "towards formal fault tree analysis using theorem proving"

Connected through hyperedge HE-3 (induced by source paper "reliability modeling and analysis of communication networks"):
  with members:
    - "analysis of network coding in a slotted aloha based two way relay network"
    - "formal dependability modeling and analysis a survey"
    - "applying formal methods to networking theory techniques and applications"
    - "towards formal fault tree analysis using theorem proving"
    - "formal analysis of soft errors using theorem proving"
    - "throughput and latency in finite buffer line networks"

Connected through hyperedge HE-4 (induced by source paper "formal availability analysis using theorem proving"):
  with members:
    - "towards formal fault tree analysis using theorem proving"

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)