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: "musings on encodings and expressiveness"
  Abstract: This paper proposes a definition of what it means for one system description language to encode another one, thereby enabling an ordering of system description languages with respect to expressive power. I compare the proposed definition with other definitions of encoding and expressiveness found in the literature, and illustrate it on a case study: comparing the expressive power of CCS and CSP.

Connected through hyperedge HE-1 (induced by source paper "ensuring liveness properties of distributed systems open problems"):
  with members:
    - "progress justness and fairness"
    - "reward testing equivalences for processes"
    - "justness a completeness criterion for capturing liveness properties"
    - "analysing mutual exclusion using process algebra with signals"
    - "lean and full congruence formats for recursion"
    - "structure preserving bisimilarity supporting an operational petri net semantics of ccsp"
    - "ccs it s not fair fair schedulers cannot be implemented in ccs like languages even under progress and certain fairness assumptions"
    - "progress fairness and justness in process algebra"

Connected through hyperedge HE-2 (induced by source paper "comparing process calculi using encodings"):
  with members:
    - "encoding csp into ccs"
    - "analysing and comparing encodability criteria"
    - "comparing the expressive power of the synchronous and asynchronous pi calculi"

Connected through hyperedge HE-3 (induced by source paper "lean and full congruence formats for recursion"):
  with members:
    - "gsos for non deterministic processes with quantitative aspects"
    - "compositionality of approximate bisimulation for probabilistic systems"
    - "branching bisimilarity with explicit divergence"

Connected through hyperedge HE-4 (induced by source paper "a note on the expressiveness of bip"):
  with members:
    - "relating bip and reo"
    - "a non interleaving process calculus for multi party synchronisation"

Connected through hyperedge HE-5 (induced by source paper "on the expressiveness of joining"):
  with members:
    - "a concurrent pattern calculus"
    - "an intensional concurrent faithful encoding of turing machines"
    - "on the expressiveness of intensional communication"
    - "psi calculi a framework for mobile processes with nominal data and logic"
    - "comparing the expressive power of the synchronous and asynchronous pi calculi"

Connected through hyperedge HE-6 (induced by source paper "ccs it s not fair fair schedulers cannot be implemented in ccs like languages even under progress and certain fairness assumptions"):
  with members:
    - "progress fairness and justness in process algebra"
    - "a process algebra for wireless mesh networks used for modelling verifying and analysing aodv"
    - "reactive turing machines"
    - "abstract processes of place transition systems"

Connected through hyperedge HE-7 (induced by source paper "core higher order session processes tractable equivalences and relative expressiveness"):
  with members:
    - "typing copyless message passing"
    - "contextual equivalence for higher order pi calculus revisited"
    - "comparing the expressive power of the synchronous and asynchronous pi calculi"

Connected through hyperedge HE-8 (induced by source paper "encoding csp into ccs"):
  with members:
    - "encoding csp into ccs extended version"
    - "analysing and comparing encodability criteria"

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)