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 "critical independent sets of a graph"):
  Abstract: Let $G$ be a simple graph with vertex set $V\left( G\right) $. A set $S\subseteq V\left( G\right) $ is independent if no two vertices from $S$ are adjacent, and by $\mathrm{Ind}(G)$ we mean the family of all independent sets of $G$. #R##N#The number $d\left( X\right) =$ $\left\vert X\right\vert -\left\vert N(X)\right\vert $ is the difference of $X\subseteq V\left( G\right) $, and a set $A\in\mathrm{Ind}(G)$ is critical if $d(A)=\max \{d\left( I\right) :I\in\mathrm{Ind}(G)\}$ (Zhang, 1990). #R##N#Let us recall the following definitions: #R##N#$\mathrm{core}\left( G\right) $ = $\bigcap$ {S : S is a maximum independent set}. #R##N#$\mathrm{corona}\left( G\right)$ = $\bigcup$ {S :S is a maximum independent set}. #R##N#$\mathrm{\ker}(G)$ = $\bigcap$ {S : S is a critical independent set}. #R##N#$\mathrm{diadem}(G)$ = $\bigcup$ {S : S is a critical independent set}. #R##N#In this paper we present various structural properties of $\mathrm{\ker}(G)$, in relation with $\mathrm{core}\left( G\right) $, $\mathrm{corona}\left( G\right) $, and $\mathrm{diadem}(G)$.

Includes members:
  Member "a set and collection lemma":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "on the critical difference of almost bipartite graphs")
  Member "vertices belonging to all critical independent sets of a graph":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "on the critical difference of almost bipartite graphs")
  Member "on the structure of the minimum critical independent set of a graph":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "critical and maximum independent sets of a graph")
  Member "critical sets in bipartite graphs":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "on the critical difference of almost bipartite graphs")

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)