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: "domain theory and the logic of observable properties"
  Abstract: The mathematical framework of Stone duality is used to synthesize a number of hitherto separate developments in Theoretical Computer Science: - Domain Theory, the mathematical theory of computation introduced by Scott as a foundation for denotational semantics. - The theory of concurrency and systems behaviour developed by Milner, Hennessy et al. based on operational semantics. - Logics of programs. #R##N#Stone duality provides a junction between semantics (spaces of points = denotations of computational processes) and logics (lattices of properties of processes). Moreover, the underlying logic is geometric, which can be computationally interpreted as the logic of observable properties---i.e. properties which can be determined to hold of a process on the basis of a finite amount of information about its execution. #R##N#These ideas lead to the following programme: #R##N#1. A metalanguage is introduced, comprising #R##N#- types = universes of discourse for various computational situations. #R##N#- terms = programs = syntactic intensions for models or points. #R##N#2. A standard denotational interpretation of the metalanguage is given, assigning domains to types and domain elements to terms. #R##N#3. The metalanguage is also given a {\em logical} interpretation, in which types are interpreted as propositional theories and terms are interpreted via a program logic, which axiomatizes the properties they satisfy. #R##N#4. The two interpretations are related by showing that they are Stone duals of each other. Hence, semantics and logic are guaranteed to be in harmony with each other, and in fact each determines the other up to isomorphism. #R##N#This opens the way to a whole range of applications. Given a denotational description of a computational situation in our meta-language, we can turn the handle to obtain a logic for that situation.

Connected through hyperedge HE-1 (induced by source paper "announcement as effort on topological spaces"):
  with members:
    - "on the solvability of inductive problems a study in epistemic topology"
    - "on the solvability of inductive problems a study in epistemic topology"
    - "a simple proof of the completeness of apal"
    - "public announcement logic in geometric frameworks"
    - "complete axiomatizations for reasoning about knowledge and time"
    - "modal logics for topological spaces"
    - "knowledge theoretic properties of topological spaces"
    - "knowledge on treelike spaces"

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)