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: "completeness theorems for pomset languages and concurrent kleene algebras"
  Abstract: Pomsets constitute one of the most basic models of concurrency. A pomset is a generalisation of a word over an alphabet in that letters may be partially ordered. A term $t$ using the bi-Kleene operations $0,1, +, \cdot\, ,^*, \parallel, ^{(*)}$ defines a language $ \mathopen{[\![ } t \mathclose{]\!] } $ of pomsets in a natural way. #R##N#We prove that every valid universal equality over pomset languages using these operations is a consequence of the equational theory of regular languages (in which parallel multiplication and iteration are undefined) plus that of the commutative-regular languages (in which sequential multiplication and iteration are undefined). We also show that the class of $\textit{rational}$ pomset languages (that is, those languages generated from singleton pomsets using the bi-Kleene operations) is closed under all Boolean operations. #R##N#An $ \textit{ideal}$ of a pomset $p$ is a pomset using the letters of $p$, but having an ordering at least as strict as $p$. A bi-Kleene term $t$ thus defines the set $ \textbf{Id} (\mathopen{[\![ } t \mathclose{]\!] }) $ of ideals of pomsets in $ \mathopen{[\![ } t \mathclose{]\!] } $. We prove that if $t$ does not contain commutative iteration $^{(*)}$ (in our terminology, $t$ is bw-rational) then $\textbf{Id} (\mathopen{[\![ } t \mathclose{]\!] }) \cap \textbf{Pom}_{sp}$, where $ \textbf{Pom}_{sp}$ is the set of pomsets generated from singleton pomsets using sequential and parallel multiplication ($ \cdot$ and $ \parallel$) is defined by a bw-rational term, and if two such terms $t,t'$ define the same ideal language, then $t'=t$ is provable from the Kleene axioms for $0,1, +, \cdot\, ,^*$ plus the commutative idempotent semiring axioms for $0,1, +, \parallel$ plus the exchange law $ (u \parallel v)\cdot ( x \parallel y) \le v \cdot y \parallel u \cdot x $.

Connected through hyperedge HE-1 (induced by source paper "completeness and incompleteness of synchronous kleene algebra"):
  with members:
    - "kleene algebra with observations"
    - "concurrent kleene algebra free model and completeness"
    - "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 "generating posets beyond n"):
  with members:
    - "kleene algebra with observations"
    - "concurrent kleene algebra free model and completeness"
    - "presenting finite posets"
    - "concurrent dynamic algebra"

Connected through hyperedge HE-3 (induced by source paper "on series parallel pomset languages rationality context freeness and automata"):
  with members:
    - "concurrent kleene algebra free model and completeness"
    - "brzozowski goes concurrent a kleene theorem for pomset languages"

Connected through hyperedge HE-4 (induced by source paper "concurrent kleene algebra free model and completeness"):
  with members:
    - "brzozowski goes concurrent a kleene theorem for pomset languages"
    - "on partial order semantics for sat smt based symbolic encodings of weak memory concurrency"

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.FL(Formal Languages and Automata Theory)