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 "towards minimizing k submodular functions"):
  Abstract: In this paper we investigate k-submodular functions. This natural family of discrete functions includes submodular and bisubmodular functions as the special cases k = 1 and k = 2 respectively. #R##N#In particular we generalize the known Min-Max-Theorem for submodular and bisubmodular functions. This theorem asserts that the minimum of the (bi)submodular function can be found by solving a maximization problem over a (bi)submodular polyhedron. We define and investigate a k-submodular polyhedron and prove a Min-Max-Theorem for k-submodular functions.

Includes members:
  Member "the complexity of conservative valued csps":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "representing fitness landscapes by valued constraints to understand the complexity of local search")
  Member "the power of linear programming for valued csps":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "piecewise linear valued csps solvable by linear programming relaxation")
  Member "extensions of the minimum cost homomorphism problem":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "binarisation for valued constraint satisfaction problems")
  Member "min csp on four elements moving beyond submodularity":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "piecewise linear valued csps solvable by linear programming relaxation")
  Member "submodularity on a tree unifying l natural convex and bisubmodular functions":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "generalized roof duality and bisubmodular functions")
  Member "on the complexity of submodular function minimisation on diamonds":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "combinatorial optimization algorithms via polymorphisms")
  Member "the approximability of max csp with fixed value constraints":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "optimal polynomial time compression for boolean max csp")

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)