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: "complexity of steiner tree in split graphs dichotomy results"
  Abstract: Given a connected graph G and a terminal set $$R \subseteq VG$$, Steiner tree asks for a tree that includes all of R with at most r edges for some integer $$r \ge 0$$. It is known from [ND12,Garey et al. [1]] that Steiner tree is NP-complete in general graphs. Split graph is a graph which can be partitioned into a clique and an independent set. K. White et al. [2] has established that Steiner tree in split graphs is NP-complete. In this paper, we present an interesting dichotomy: we show that Steiner tree on $$K_{1,4}$$-free split graphs is polynomial-time solvable, whereas, Steiner tree on $$K_{1,5}$$-free split graphs is NP-complete. We investigate $$K_{1,4}$$-free and $$K_{1,3}$$-free also known as claw-free split graphs from a structural perspective. Further, using our structural study, we present polynomial-time algorithms for Steiner tree in $$K_{1,4}$$-free and $$K_{1,3}$$-free split graphs. Although, polynomial-time solvability of $$K_{1,3}$$-free split graphs is implied from $$K_{1,4}$$-free split graphs, we wish to highlight our structural observations on $$K_{1,3}$$-free split graphs which may be used in other combinatorial problems.

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.DM(Discrete Mathematics)