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: "designing a semantic model for a wide spectrum language with concurrency"
  Abstract: A wide-spectrum language integrates specification constructs into a programming language in a manner that treats a specification command just like any other command. This paper investigates a semantic model for a wide-spectrum language that supports concurrency and a refinement calculus. In order to handle specifications with rely and guarantee conditions, the model includes explicit environment steps as well as program steps. A novelty of our approach is that we define a set of primitive commands and operators, from which more complex specification and programming language commands are built. The primitives have simple algebraic properties which support proof using algebraic reasoning. The model is general enough to specify notions as diverse as rely-guarantee reasoning, temporal logic, and progress properties of programs, and supports refining specifications to code. It also forms an instance of an abstract concurrent program algebra, which facilitates reasoning about properties of the model at a high level of abstraction.

Connected through hyperedge HE-1 (induced by source paper "some challenges of specifying concurrent program components"):
  with members:
    - "a synchronous program algebra a basis for reasoning about shared memory and event based concurrency"
    - "an algebra of synchronous atomic steps"
    - "generalised rely guarantee concurrency an algebraic foundation"

Connected through hyperedge HE-2 (induced by source paper "unifying theories of reactive design contracts"):
  with members:
    - "unifying theories of time with generalised reactive processes"
    - "an algebra of synchronous atomic steps"
    - "generalised rely guarantee concurrency an algebraic foundation"

Connected through hyperedge HE-3 (induced by source paper "a synchronous program algebra a basis for reasoning about shared memory and event based concurrency"):
  with members:
    - "possible values exploring a concept for concurrency"
    - "an algebra of synchronous atomic steps"
    - "generalised rely guarantee concurrency an algebraic foundation"

Connected through hyperedge HE-4 (induced by source paper "an algebra of synchronous atomic steps"):
  with members:
    - "generalised rely guarantee concurrency an algebraic foundation"

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)