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: "proceedings of second international symposium on games automata logics and formal verification gandalf 2011 electronic proceedings in theoretical computer science"
  Abstract: This volume contains the Proceedings of the Second International Symposium on Games, Automata, Languages, and Formal Verification (GandALF 2011). The conference was held in Minori (Amalfi Coast, Italy), from the 15th to the 17th of June 2011. The aim of the GandALF Symposium is to provide a forum for researchers from different areas and with different background, that share a common interest in game theory, mathematical logic, automata theory, and their applications to the specification, design, and verification of complex systems. This proceedings contain the abstracts of three invited talks and nineteen regular papers that have been selected through a rigorous reviewing process according to originality, quality, and relevance to the topics of the symposium.

Connected through hyperedge HE-1 (induced by source paper "weighted linear dynamic logic"):
  with members:
    - "parametric linear dynamic logic"
    - "discounting in ltl"

Connected through hyperedge HE-2 (induced by source paper "parametric linear dynamic logic"):
  with members:
    - "approximating optimal bounds in prompt ltl realizability in doubly exponential time"
    - "optimal bounds in parametric ltl games"

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)