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 "an algebraic preservation theorem for aleph zero categorical quantified constraint satisfaction"):
  Abstract: We prove an algebraic preservation theorem for positive Horn definability in#N#aleph-zero categorical structures. In particular, we define and study a#N#construction which we call the periodic power of a structure, and define a#N#periomorphism of a structure to be a homomorphism from the periodic power of#N#the structure to the structure itself. Our preservation theorem states that,#N#over an aleph-zero categorical structure, a relation is positive Horn definable#N#if and only if it is preserved by all periomorphisms of the structure. We give#N#applications of this theorem, including a new proof of the known complexity#N#classification of quantified constraint satisfaction on equality templates.

Includes members:
  Member "quantified constraints and containment problems":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "qcsp monsters and the demise of the chen conjecture")
  Member "on the scope of the universal algebraic approach to constraint satisfaction":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "finite relation algebras with normal representations")
  Member "complexity of existential positive first order logic":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "on the scope of the universal algebraic approach to constraint satisfaction")
  Member "the complexity of positive first order logic without equality":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "from complexity to algebra and back digraph classes collapsibility and the pgp")
  Member "the complexity of quantified constraint satisfaction collapsibility sink algebras and the three element case":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "qcsp monsters and the demise of the chen conjecture")

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)