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: "discriminating lambda terms using clocked boehm trees"
  Abstract: As observed by Intrigila, there are hardly techniques available in the#N#lambda-calculus to prove that two lambda-terms are not beta-convertible.#N#Techniques employing the usual Boehm Trees are inadequate when we deal with#N#terms having the same Boehm Tree (BT). This is the case in particular for fixed#N#point combinators, as they all have the same BT. Another interesting equation,#N#whose consideration was suggested by Scott, is BY = BYS, an equation valid in#N#the classical model P-omega of lambda-calculus, and hence valid with respect to#N#BT-equality but nevertheless the terms are beta-inconvertible. To prove such#N#beta-inconvertibilities, we employ `clocked' BT's, with annotations that convey#N#information of the tempo in which the data in the BT are produced. Boehm Trees#N#are thus enriched with an intrinsic clock behaviour, leading to a refined#N#discrimination method for lambda-terms. The corresponding equality is strictly#N#intermediate between beta-convertibility and Boehm Tree equality, the equality#N#in the model P-omega. An analogous approach pertains to Levy-Longo and#N#Berarducci Trees. Our refined Boehm Trees find in particular an application in#N#beta-discriminating fixed point combinators (fpc's). It turns out that Scott's#N#equation BY = BYS is the key to unlocking a plethora of fpc's, generated by a#N#variety of production schemes of which the simplest was found by Boehm, stating#N#that new fpc's are obtained by postfixing the term SI, also known as Smullyan's#N#Owl. We prove that all these newly generated fpc's are indeed new, by#N#considering their clocked BT's. Even so, not all pairs of new fpc's can be#N#discriminated this way. For that purpose we increase the discrimination power#N#by a precision of the clock notion that we call `atomic clock'.

Connected through hyperedge HE-1 (induced by source paper "clocked lambda calculus"):
  with members:
    - "modular construction of fixed point combinators and clocked boehm trees"
    - "neighbourhood structures bisimilarity and basic model theory"
    - "infinitary combinatory reduction systems confluence"

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)