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: "representations of stream processors using nested fixed points"
  Abstract: We define representations of continuous functions on infinite streams of dis- crete values, both in the case of discrete-valued functions, and in the case of stream-valued functions. We define also an operation on the representations of two continuous functions between streams that yields a representation of their composite. In the case of discrete-valued functions, the representatives are well-founded (finite- path) trees of a certain kind. The underlying idea can be traced back to Brouwer's justi- fication of bar-induction, or to Kreisel and Troelstra's elimination of choice-sequences. In the case of stream-valued functions, the representatives are non-wellfounded trees pieced together in a coinductive fashion from well-founded trees. The definition requires an al- ternating fixpoint construction of some ubiquity.

Connected through hyperedge HE-1 (induced by source paper "infinite types infinite data infinite interaction"):
  with members:
    - "bisimulation as path type for guarded recursive types"
    - "cubical type theory a constructive interpretation of the univalence axiom"
    - "non wellfounded trees in homotopy type theory"
    - "a linear category of polynomial functors extensional part"
    - "a linear category of polynomial diagrams"
    - "relating coalgebraic notions of bisimulation"
    - "programming interfaces and basic topology"

Connected through hyperedge HE-2 (induced by source paper "the word problem for omega terms over the trotter weil hierarchy"):
  with members:
    - "the separation problem for regular languages by piecewise testable languages"
    - "separating regular languages by piecewise testable and unambiguous languages"
    - "ehrenfeucht fraisse games on omega terms"
    - "the join levels of the trotter weil hierarchy are decidable"
    - "on logical hierarchies withinfoâ definable languages"
    - "the fo2 alternation hierarchy is decidable"
    - "structure theorem and strict alternation hierarchy for fo2 on words"

Connected through hyperedge HE-3 (induced by source paper "stream differential equations specification formats and solution methods"):
  with members:
    - "presenting distributive laws"
    - "sound and complete axiomatizations of coalgebraic language equivalence"
    - "coalgebraic characterizations of context free languages"
    - "automatic sequences and zip specifications"
    - "well definedness of streams by transformation and termination"
    - "rational streams coalgebraically"

Connected through hyperedge HE-4 (induced by source paper "from algebra to logic there and back again the story of a hierarchy"):
  with members:
    - "essential convexity and complexity of semi algebraic constraints"
    - "an effective characterization of the alternation hierarchy in two variable logic"
    - "the fo2 alternation hierarchy is decidable"
    - "structure theorem and strict alternation hierarchy for fo2 on words"

Connected through hyperedge HE-5 (induced by source paper "a new order theoretic characterisation of the polytime computable functions"):
  with members:
    - "a combination framework for complexity"
    - "polynomial path orders"
    - "on constructor rewrite systems and the lambda calculus"
    - "polynomial path orders a maximal model"
    - "automated complexity analysis based on the dependency pair method"
    - "proof theory at work complexity analysis of term rewrite systems"
    - "on tiered small jump operators"
    - "a new function algebra of exptime functions by safe nested recursion"

Connected through hyperedge HE-6 (induced by source paper "the join levels of the trotter weil hierarchy are decidable"):
  with members:
    - "on logical hierarchies withinfoâ definable languages"
    - "the fo2 alternation hierarchy is decidable"
    - "structure theorem and strict alternation hierarchy for fo2 on words"

Connected through hyperedge HE-7 (induced by source paper "type based termination inflationary fixed points and mixed inductive coinductive types"):
  with members:
    - "miniagda integrating sized and dependent types"
    - "semi continuous sized types and termination"
    - "a type based termination criterion for dependently typed higher order rewrite systems"

Connected through hyperedge HE-8 (induced by source paper "nested hoare triples and frame rules for higher order store"):
  with members:
    - "relational parametricity and separation logic"
    - "logical reasoning for higher order functions with local state"
    - "context sensitive languages rational graphs and determinism"
    - "semantics of separation logic typing and higher order frame rules for algol like languages"

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.DS(Data Structures and Algorithms)