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: "searching publications on operating systems"
  Abstract: This note concerns a search for publications in which one can find statements that explain the concept of an operating system, reasons for introducing operating systems, a formalization of the concept of an operating system or theory about operating systems based on such a formalization. It reports on the way in which the search has been carried out and the outcome of the search. The outcome includes not only what the search was meant for, but also some added bonuses.

Connected through hyperedge HE-1 (induced by source paper "bitcoin and beyond exclusively informational money"):
  with members:
    - "practical aspects of the bitcoin system"
    - "the unreasonable fundamental incertitudes behind bitcoin mining"
    - "informaticology combining computer science data science and fiction science"
    - "formaleuros formalcoins and virtual monies"
    - "on the definition of a theoretical concept of an operating system"
    - "machine structure oriented control code logic"
    - "a static theory of promises"

Connected through hyperedge HE-2 (induced by source paper "putting instruction sequences into effect"):
  with members:
    - "instruction sequence processing operators"
    - "on the expressiveness of single pass instruction sequences"
    - "indirect jumps improve instruction sequence performance"
    - "on the contribution of backward jumps to instruction sequence expressiveness"
    - "searching publications on software testing"
    - "a progression ring for interfaces of instruction sequences threads and services"
    - "instruction sequences with dynamically instantiated instructions"
    - "machine structure oriented control code logic"

Connected through hyperedge HE-3 (induced by source paper "stratified outsourcing theory"):
  with members:
    - "business mereology imaginative definitions of insourcing and outsourcing transformations"
    - "formaleuros formalcoins and virtual monies"
    - "searching publications on software testing"
    - "machine structure oriented control code logic"

Connected through hyperedge HE-4 (induced by source paper "steering fragments of instruction sequences"):
  with members:
    - "instruction sequence processing operators"
    - "formaleuros formalcoins and virtual monies"
    - "informal control code logic"
    - "on the contribution of backward jumps to instruction sequence expressiveness"
    - "searching publications on software testing"
    - "machine structure oriented control code logic"
    - "thread extraction for polyadic instruction sequences"

Connected through hyperedge HE-5 (induced by source paper "business mereology imaginative definitions of insourcing and outsourcing transformations"):
  with members:
    - "formaleuros formalcoins and virtual monies"
    - "informal control code logic"
    - "searching publications on software testing"
    - "a progression ring for interfaces of instruction sequences threads and services"
    - "machine structure oriented control code logic"
    - "interface groups and financial transfer architectures"

Connected through hyperedge HE-6 (induced by source paper "formaleuros formalcoins and virtual monies"):
  with members:
    - "on the definition of a theoretical concept of an operating system"
    - "an interface group for process components"
    - "machine structure oriented control code logic"
    - "tuplix calculus specifications of financial transfer networks"
    - "a static theory of promises"
    - "interface groups and financial transfer architectures"

Connected through hyperedge HE-7 (induced by source paper "informal control code logic"):
  with members:
    - "instruction sequence processing operators"
    - "formaleuros formalcoins and virtual monies"
    - "searching publications on software testing"
    - "a progression ring for interfaces of instruction sequences threads and services"
    - "machine structure oriented control code logic"
    - "thread extraction for polyadic instruction sequences"

Connected through hyperedge HE-8 (induced by source paper "on the definition of a theoretical concept of an operating system"):
  with members:
    - "thread algebra for poly threading"

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.OS(Operating Systems)