human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "two formal systems of the lambda delta family revised"):
  Abstract: We present the framework $\lambda\delta$-2B that significantly improves and generalizes two previous formal systems of the $\lambda\delta$ family, i.e., $\lambda\delta$-1A and $\lambda\delta$-2A. Our main contributions are, on the one hand, a short definition for the framework and, on the other hand, some important results that we are presenting here for the first time. The definition stands just on two notions, i.e., bound rt-reduction and parametric validity. Our new results are the confluence of bound rt-reduction on valid terms, the decidability of validity, of type inference and type checking and an axiomatization of the type judgment for the system $\lambda\delta$-2A. As a key feature, the framework and its theory have been developed and checked with the unavoidable help of the interactive prover Matita.

Includes members:
  Member "an extended type system with lambda typed lambda expressions":
    also connected through other hyperedges:
      (none)
  Member "tight typings and split bounds":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "the bang calculus revisited")
  Member "leftmost outermost beta reduction is invariant indeed":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "the abstract machinery of interaction long version")

Question: Please tell me which class the source paper 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)