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: "searching for an algebra on csp solutions"
  Abstract: The Constraint Satisfaction Problem (CSP) is a problem of computing a homomorphism ${\bf R}\to {\bf \Gamma}$ between two relational structures, where ${\bf R}$ is defined over a domain $V$ and ${\bf \Gamma}$ is defined over a domain $D$. In fixed template CSPs, denoted $CSP({\bf \Gamma})$, the right side structure ${\bf \Gamma}$ is fixed and the left side structure ${\bf R}$ is unconstrained. #R##N#In the last 2 decades it was impressively revealed that those templates ${\bf \Gamma}$ are tractable that are preserved under certain polymorphisms $p_1, ..., p_k$. Moreover, the set of all homomorphisms from ${\bf R}$ to ${\bf \Gamma}$ are preserved under the same $p_1, ..., p_k$. I.e. $p_1, ..., p_k$ not only guide us in the decision problem, but also define algebraic properties of the solutions set. #R##N#This view makes of interest the following formulation: given a prespecified finite set of algebras ${\mathcal B}$ whose domain is $D$, is it possible to present the solutions set of a CSP instance as a subalgebra of ${\mathbb A}_1\times ... \times {\mathbb A}_{|V|}$ where ${\mathbb A}_i\in {\mathcal B}$? #R##N#We study this formulation and prove that the latter problem itself is an instance of a certain fixed-template CSP, over another template ${\bf \Gamma}^{\mathcal B}$. We prove that $CSP({\bf \Gamma}^{\mathcal B})$ can be reduced to a certain fragment of $CSP({\bf \Gamma})$, under natural assumptions on ${\mathcal B}$. #R##N#We also study the conditions under which $CSP({\bf \Gamma})$ can be reduced to $CSP({\bf \Gamma}^{\mathcal B})$. Since the complexity of $CSP({\bf \Gamma}^{\mathcal B})$ is defined by $Pol({\bf \Gamma}^{\mathcal B})$, we study the relationship between $Pol({\bf \Gamma})$ and $Pol({\bf \Gamma}^{\mathcal B})$. It turns out that if $\mathcal{B}$ is preserved by some $p\in Pol({\bf \Gamma})$, then $p$ can be extended to a polymorphism of ${\bf \Gamma}^{\mathcal B}$.

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.CC(Computational Complexity)