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 "classification of minimally unsatisfiable 2 cnfs"):
  Abstract: We consider minimally unsatisfiable 2-CNFs, i.e., minimally unsatisfiable conjunctive normal forms, where each clause contains at most 2 literals (short 2-MUs). Characterisations of 2-MUs in the literature have been restricted to the nonsingular case (where every variable occurs positively and negatively at least twice), and those with a unit-clause. We provide the full classification of 2-MUs, and obtain polytime isomorphism decision. #R##N#The main tool used here is the implication digraph, which allows to reduce the problem of determining the isomorphism types of 2-MUs to the isomorphism types of "weak double cycles" (WDCs), obtained from the digraph versions of undirected cycles by splitting vertices and arcs. We show that these digraphs have at most one skew-symmetry, and thus the skew-symmetric WDCs can be considered as 2-CNFs.

Includes members:
  Member "on the computational complexity of read once resolution decidability in 2cnf formulas":
    also connected through other hyperedges:
      (none)
  Member "on davis putnam reductions for minimally unsatisfiable clause sets":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "unsatisfiable hitting clause sets with three more clauses than variables")
  Member "redundancy in logic ii 2cnf and horn propositional formulae":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "sld resolution reduction of second order horn fragments technical report")

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.DM(Discrete Mathematics)